Gerceker K., Kilcik A. Prediction of Solar Cycle 25 Using Simplex Projection Method: A Long-Term Analysis Based on F10.7 01
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Gopalswamy N., Akiyama S., Yashiro S., Mäkelä P., Xie H., Michalek G. The Backreaction of the Reduced Heliospheric Pressure on CMEs and Its Implications for the Strength of Solar Cycle 25 09
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Özgüç A., Kilcik A., Calisir M. Temporal Variation of 10.7 cm Solar Radio Flux and Selected Cosmic, Geomagnetic, and Interplanetary Indicators during Solar Cycle 24 18
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Rozelot J.P., Kilcik A. A Needle in a Haystack: The Leptocline 25
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Tirnakci М., Asenovski S., Kilcik A. Investigation of Potential Sources of Solar Energetic Particles (SEPs) 38
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Tsvetkov Ts., Petrov N., Minev M., Zinkova Y. Total Solar Eclipse of 2024 April 8: A Research Expedition to Mexico 43
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Gromova L.I., Kleimenova N.G., Gromov S.V., Malysheva L.M. Moderate Magnetic Storm Expected as a Typical Space Weather Event in the Era of the Decreased Solar Activity 48
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Guineva V., Werner R., Bojilova R., Raykova L., Atanassov A., Valev D. Analysis of Substorms Related to Strong MPB at Panagjurishte Station in 2022 56
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Lytvynenko O.A., Panishko S.K. Angular Dependencies of the Ionospheric Scintillation Parameters Based on Observations of the Cosmic Radio Sources in the Decameter Radio Wave Range 64
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Stefan C., Dobrica V. St. Patrick’s Day 2015 Geomagnetic Storm: Sources of Perturbations 70
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Dachev T.P., Sapundjiev P.V., Tomov B.T., Matviichuk Y.N., Mitev M.M., Georgieva K.Ya., Kirov B.B., Jordanova M.M., Krezhov K.A. Dose Rate and Flux Measurements During a Travel from Bulgarian Antarctic Base on Livingston Island to Sofia, Bulgaria 75
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Krastev K., Semkova J., Koleva R., Benghin V., Drobyshev S. An Assessment of the Radiation Risk in Orbit Around Mars, Based on Measurements by the Lyulin Instrument and Numerical Simulations 83
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Chapanov Ya., Ron C., Vondrak J. Solar Influence on Chandler Period 88
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Tonev P. Hypothetic Explanation of Peculiar Atmospheric Electric Response to SEP at High Latitudes. Experimental Evidence. 94
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Veretenenko S.V., Dmitriev P.B. Comparative Analysis of Solar Activity Influences on Trajectories of Extratropical Cyclones in Different Regions of the North Atlantic 100
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Sakan N.M., Simić Z., Srećković V.A., Dechev M. Potential Candidates for Cut-off Dense Plasma Modeling 106
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Elias A.G., Medina F.D., Duran T., Zossi B.Z., de Haro Barbas B.F. Six EUV Solar Radiation Proxies: A Comparative Analysis 01
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Obridko V., Sokoloff D., Katsova M. Some Comments on the Matching of Photometric and Magnetic Properties of Structures at the Solar Surface 07
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Sokoloff D.D., Serenkova A.Yu., Yushkov E.V. The Numerical Determining of the Magnetic Dynamo Growth Rate During a Parametric Resonance 13
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Tirnakci M., Asenovski S., Kilcik A. Investigation of Solar Energetic Particles (SEPs) Associated with X-Ray Solar Flares 18
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Adibekyan M.V. The Analysis of Observations of Ionospheric and Geomagnetic Time Series for Detection of Precursors of Earthquakes 23
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Adibekyan M.V., Gulyan A.G., Sargsyan S.A., Arakelyan H.S. Investigation of the Type of Radio Emissions from Sources of Radio Emissions Such as: Seismo-Ionospheric Communications, Galactic Background, "Swan-A" and "Cassiopeia-A" By Vertical Ionospheric Sounding at a Wavelength of 4.2 M 26
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Bojilova R., Mukhtarov P. Verification of the Methodology for Forecasting the Ionosphere over Bulgaria in the Conditions of the Geomagnetic Storm on 27 February 2023 29
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Despirak I.V., Lubchich A.A., Kleimenova N.G. Space Weather Conditions and Non-Storm Supersubstorms Observations 35
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Despirak I.V., Setsko P.V., Sakharov Ya.A., Bilin V.A., Lubchich A.A., Selivanov V.N. Geomagnetically Induced Currents During Different Types of the Solar Wind 41
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Gopalswamy N., Akiyama S., Yashiro S., Makela P., Xie H. Intense Geomagnetic Storms during Solar Cycles 23-25 47
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Guineva V.H., Werner R., Atanassov A.M., Bojilova R.Ts., Raykova L.N., Valev D.T. Determination of the Parameters of Midlatitude Positive Bays Caused by Magnetospheric Substorms 56
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Kleimenova N.G., Despirak I.V., Malysheva L.M., Gromova L.I., Lubchich A.A., Gromov S.V. Harang Discontinuity, “Polar” Substorms and Subauroral Positive Magnetic Bays 64
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Lubchich A.A., Despirak I.V., Werner R. Intense Mid-Latitude Magnetic Disturbances and Solar Wind Conditions 70
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Özgüç A., Kilcik A. Temporal Offsets between Solar Flare Index and Cosmic, Geomagnetic, and Interplanetary Indicators during Solar Cycle 24 76
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Panishko S.K., Lytvynenko O.A. Short Period Variations of the Parameters of Ionospheric Scintillations on the Long-Time Observations of the Cosmic Radio Sources at the Decameter Radio Waves 82
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Potužníková K., Koucká Knížová P., Chum J., Podolská K., Kouba D., Mošna Z., Georgieva K., Bojilova R., Kirov B., Asenovski A. Summer Tropospheric Mesoscale Situations with Impact on the Ionospheric Plasma 89
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Dachev T.P., Tomov B.T., Matviichuk Y.N., Dimitrov P.G., Semkova J.V., Koleva R.T., Jordanova M.M., Bankov N.G., Mitev M.G., Krastev K.N., Malchev S.P., Reitz G., Header D.-P. Penetration of Energetic Electrons from Outer Radiation Belt to Lower L-Values and to Inner Radiation Belt 98
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Dechev M.Ts., Kozarev K. LOFAR-BG Current State 104
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Krastev K., Semkova S., Koleva R., Benghin V., Drobyshev S. Numerical Simulation of the LIULIN-MO Device 108
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Chapanov Y. Common Cycles of Solar Activity and Antarctic Oscillations 114
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Petrov N., Tsvetkov Ts., Tyutyundzhiev N., Semkov Е., Mishev А., Shirov G., Zinkova Y., Mutafov A., Nichev H., Petrov M., Angelov H., Arsov T., Serafimov N., Georgiev G. New Research Project: Ground-Based Monitoring of Cosmic Particles and Space Weather 120
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Tonev P., Asenovski S. Hypothetic Atmospheric Response to SEP Explaining Peculiar Electric Fields and Currents at High Latitudes 125
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Veretenenko S.V., Dmitriev P.B. Solar Activity Influences on Extratropical Cyclone Trajectories in the North Atlantic 132
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Podgorny A.I., Podgorny I.M. Problems Arising in Studying the Mechanism of a Solar Flare by the Way of Comparing the Results of MHD Simulations Above the Real Active Region with Observations 138
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Roša D., Skokić I., Hržina D., Maričić D., Šterc F., Romštajn I. Possible Method for Determining Direction of Motion of Coronal Mass Ejections 144
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Adibekyan M.V. Pre-Earthquake Anomalies in the Ionospheric and Geomagnetic Parameters 01
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Zhukova A.V., Khlystova A.I., Abramenko V.I., Sokoloff D.D. Temporal and Latitudinal Distribution of Anti-Hale Active Regions in the Synthetic Solar Cycle 04
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Despirak I.V., Lubchich A.A., Kleimenova N.G., Setsko P.V., Werner R. Supersubstorm on 20 December 2015: Spatial Geomagnetic Effects 10
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Gromova L.I., Kleimenova N.G., Despirak I.V., Gromov S.V., Lubchich A.A., Malysheva L.M. Polar Geomagnetic Disturbances and Auroral Substorms During the Magnetic Storm on 20 April 2020 16
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Guineva V., Werner R., Bojilova R., Atanassov A., Raykova L., Valev D. Maps of the Spatial Distribution of the Variations in the X and Y Components of the Magnetic Field at European Midlatitudes During Substorms: A Case Study 22
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Kilcik A., Tirnakci M. Critical Frequency of Ionospheric F1 and F2 Layers and Comparison with Solar Flares Observed in the 24th Solar Cycle 29
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Kleimenova N.G., Despirak I.V., Malysheva L.M., Gromova L.I., Gromov S.V., Lubchich A.A., Guineva V., Werner R. Morning Polar Substorms and Their Possible Mid-Latitude Effects 35
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Lytvynenko O., Panishko S., Derevyagin V. Dependence of the Ionospheric Scintillations Intensity of Cosmic Radio Sources on Their Position in the Sky 41
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Dachev T.P., Tomov B.T., Matviichuk Y.N., Dimitrov P.G., Mitev M.G., Semkova J.V., Koleva R.T., Jordanova M.M., Bankov N.G., Krastev K., Malchev S., Mitrofanov I., Litvak M., Kozyrev A., Golovin D., Benghin V.V., Shurshakov V.A. Overview of the Space Radiation Extreme Events Observed with Liulin Type Instruments 49
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Semkova J., Koleva R., Benghin V., Krastev K., Matviichuk Yu., Tomov B., Bankov N., Dachev T., Maltchev S., Mitrofanov I., Malakhov A., Kozyrev A., Golovin D., Mokrousov M., Sanin A., Litvak M., Nikiforov S., Lisov D., Anikin A., Shurshakov V., Drobyshev S. Observation of Solar Energetic Particle Events Onboard ExoMars TGO in July 2021-March 2022 55
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Chapanov Y. Solar Influence on Ozone Variations over ENSO Regions 61
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Kirov B., Georgieva K., Asenovski S. Space Weather and Its Effects on Spacecraft Charging 68
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Tonev P.T. Peculiar Atmospheric Electric Field Response at High Latitude to Three Major SEP Events in 2001 and Possible Interpretation 77
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Asenovski S., Georgieva K., Kirov B. Open Access Database for Different Types of Solar Wind 83
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Kirov B., Georgieva K., Asenovski S., Madjarska M.S., Dineva E.A. A Comparison Between the Solar Activity in the 11-Year Sunspot Cycles During the Last Two Centennial Solar Activity Minima and a Comparison of the Geomagnetic Activity During the Same Periods 87
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Adibekyan M.V. Analyse of Ionospheric and Geomagnetic Pre-earthquake Anomalies 01
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Boeva S., Zamanov R., Koleva K., Dechev M. Flares in Low State in KR Aurigae 04
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Borisenko A.V., Podgorny I.M., Podgorny A.I. First Flare M 1.9 AR 10365: Comparing Results Real-Scale Time MHD Modeling and Observational Data 08
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Bubnov I.N., Stanislavsky L.A., Yerin S.N. Simultaneous Observations of Solar Radio Bursts with Ukrainian Radiotelescopes and by Parker Solar Probe During its Encounter 14
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Elias A.G., de Haro Barbas B.F., Medina F.D., Zossi B.S. On the Correlation between EUV Solar Radiation Proxies and Their Long-Term Association 20
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Isaeva E.A. Relationship Between the Intensity of the SCR Proton Flux and the Parameters of Type II Radio Bursts in the 25-180 MHz Range 24
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Kalinichenko M.M., Kuhai N.V., Konovalenko O.O., Romanchuk O.I., Brazhenko A.I., Ivantishin O.L., Stasiuk T.A. Statistical Characteristics of Radio Source Scintillations at Decameter Wavelengths 28
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Koleva K., Devi P., Duchlev P., Dechev M., Chandra R., Simić Z. Properties of Filament Eruption and Associated Flare Ribbons on 2021 May 9 34
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Komitov B.P. Predictions for SC25, 26 and SC27 Magnitudes in Relation to the Long-Term Solar Activity Changes 40
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Krastev K., Semkova J., Koleva R., Benghin V., Drobyshev S. Temporal Analysis of the GCR Flux Obtained from the Liulin-MO Instrument in Orbit Around Mars 45
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Kuhai N.V., Kalinichenko M.M., Konovalenko O.O., Olyak M.R., Brazhenko A.I. Solar Wind Stream Structure by IPS Observations at Decameter Wavelengths 50
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Melnik V.N., Shepelev V.A., Dorovskyy V.V., Brazhenko Interferometer Observations of Type II and Type IV Bursts at 20 and 25 MHz in May 2014 56
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Nakeva Y., Tsvetkov Ts., Petrov N., Shirov G. Preliminary Results of Statistical Study on the Solar Cycle 24: Active Regions vs. Coronal Mass Ejections 62
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Obridko V.N., Sokoloff D.D., Pipin V.V., Shibalova A.S. Medium-Term Oscillations of the Solar Activity 66
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Ozguc A., Kilcik A. Temporal Variation of Solar Flare Index for the Last Solar Cycle (Cycle 24) 74
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Podgorny A.I., Podgorny I.M., Borisenko A.V., Meshalkina N.S. MHD Simulation of a Flare Situation in Real Scale of Time Above AR 10365: Development of a Technique, Choice of Parameters, The Appearance of Field Singularities at Flare Sites 80
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Roša D., Hržina D., Husak M., Brajša R., Špoljarić D., Skokić I., Maričić D., Šterc F., Romštajn I. Determination of the Solar Rotation Elements and Period from Ruđer Bošković's Sunspot Observations in 1777 86
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Rozelot J.P., Kosovichev A.G. Solar Gravitational Moments: What Are They and What Do They Do? A Short Comprehensive Review 92
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Shevchuk M., Melnik V., Dorovskyy V., Konovalenko A. Determination of the CME Core Parameters by Means of the Associated Spikes 98
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Sima A.R., Dobrica V., Demetrescu C. On the Magnetosphere Stand-Off Distance at the Timescale of Geomagnetic Storms 102
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Sokoloff D.D. Continuous Component of Solar Activity Spectrum and Solar Dynamo 109
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Tsvetkov Ts., Petrov N., Shirov G. Properties of Solar Activity Phenomena Detected During 2020 December 14 Total Solar Eclipse 111
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Yermolaev Yu.I., Lodkina I.G., Khokhlachev A.A., Yermolaev M.Yu. Decrease in Solar Wind Parameters After a Minimum of 22-23 Solar Cycles 117
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Zharkova V.V., Popova E., Shepherd S., Zharkov S.I. Probing the Double Dynamo Model with Solar-Terrestrial Activity in the Past Millennia 122
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Guineva V., Werner R., Atanassov A., Bojilova R., Raykova L., Valev D. Characteristics of the Midlatitude Effects of Different Substorms 135
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Kleimenova N.G., Despirak I.V., Malysheva L.M., Gromova L.I., Lubchich A.A. Polar Substorm, Svalbard Auroras and Mid-Latitude Positive Magnetic Bays: Case Study 141
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Shepeliev V., Lytvynenko O. Impact of Space Weather on Ionospheric Scintillation 147
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Tirnakci М., Kilcik А. The Relationship Between Solar Activity and Geomagnetic Activity Indices in the Last Four Solar Cycles 153
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Werner R., Guineva V., Atanassov A., Bojilova R., Raykova L., Valev D., Lubchich A., Despirak I. Calculation of the Horizontal Power Perturbations of the Earth Surface Magnetic Field 159
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Bojilova R., Mukhtarov P. A New Approach for Forecasting the Main Ionospheric Parameters Over Bulgaria 165
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Kirov B., Georgieva K., Asenovski S., Shepelev V., Litvinenko O. “Obstanovka” Experiment on Determining Spacecraft Surface Charging Aboard the International Space Station 171
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Dachev T., Dimitrov P., Tomov B., Matviichuk Y., Semkova J., Koleva R., Jordanova M., Bankov N., Mitev M., Carlucci P., Cairo F., Kostadinov I., Paciucci L. Prediction and Measurement of the Space Radiation Altitudinal Profile During the Flight of the Virgin Galactic SpaceShipTwo 177
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Chapanov Ya. Atlantic Multidecadal Oscillation Driven by Solar Harmonics 183
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Chapanov Ya. Solar and Cosmic Rays Influence on Winter Temperature Variations in North Siberia 189
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Koucka Knizova P., Podolska K., Kouba D., Mosna Z., Potuznikova K., Sindelarova T., Boska J. Tropospheric Mesoscale Systems and Their Signatures Within the Ionosphere 195
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Tonev P.T. Detecting Common Origin of Atmospheric Electric Responses During SEP 201
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Velichkova T.P., Kilifarska N.A. Geomagnetic Field’s Contribution to the Global Rise of Air Surface Temperature 207
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Veretenenko S.V. Influence of Solar Proton Events of January 2005 on the Middle Atmosphere Circulation: Southern Hemisphere 214
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Georgieva K., Asenovski S., Kirov B. Criteria for Identification of Geoeffective Solar Events 220
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Rozelot J.P., Kosovichev A.G., Kilcik A., Sahin S., Xu Y., Javaraiah J., Georgieva K., Özgüҫ A. Solar Multipolar Moments: An Up-to-Date Pedagogical Approach. Implications for Stellar Properties. Part I: An Analytical Overview (TUTORIAL) 01
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Katsova M.M., Obridko V.N., Sokoloff D.D., Livshits I.M. On Superflares on the Sun and Stars 25
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Koleva K., Chandra R., Joshi R., Devi P., Duchlev P., Dechev M. Morphological and Kinematical Study of Causally-Linked Filament Eruptions 31
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Tsvetkov Ts., Petrov N. New 30-cm Solar Telescope at National Astronomical Observatory Rozhen 36
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Tsvetkov Ts., Petrov N., Miteva R., Ivanov E., Popov V. Bulgarian Expedition for the Total Solar Eclipse on 2020 December 14 40
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Bojilova R., Mukhtarov P. Functional Dependence of the Critical Frequency of the Ionospheric F2-Layer on Geomagnetic Activity 44
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Bojilova R., Mukhtarov P. Relationship Between Short-Term Variations in Solar Activity and Critical Frequency of the Ionospheric F2 Layer 49
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Despirak I.V., Lubchich A.A., Kleimenova N.G. Certain Space Weather Conditions for a Supersubstorm Appearance 53
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Gromova L.I., Kleimenova N.G., Gromov S.V., Malysheva L.M. Local and Global Longitudinal Geomagnetic SC Effects at High Latitudes: Case Study of the Interval of March 07-15, 2012 59
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Guineva V., Werner R. Substorm Activity During the Geomagnetic Storm on 25 August 2018 65
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Kleimenova N.G., Gromova L.I., Gromov S.V., Malysheva L.M. Strong High-Latitude Geomagnetic Response to the Initial Phase of the Magnetic Storm on 5 April 2010 71
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Lytvynenko O.A., Panishko S.K. Variations of the Ionosphere Scintillation Parameters on the Observations of the Cosmic Radio Sources at the Decameter Wave Range During Two Cycles of the Solar Activity 77
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Borisenko A.V., Podgorny I.M., Podgorny A.I. Using of Parallel Computing on GPUs for MHD Modeling of Solar Flare Behavior in Real Time Scale 81
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Shepherd M.G., Shepherd G.G., Barreto C.S., Cho Y.M., Chen Y. Thermospheric Wind Variability at High Latitudes – The Wind Wall 87
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Podgorny A.I., Podgorny I.M., Borisenko A.V. Study of the Solar Flare Mechanism by MHD Simulation in the Corona Above the Active Region in Real Time Scale 93
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Dachev T., Semkova J., Tomov B., Matviichuk Y., Dimitrov P., Koleva R., Jordanova M., Bankov N., Litvak M., Mitrofanov I., Golovin D., Kozyrev A., Malakhov A., Mokrousov M., Sanin A., Tretyakov V., Fedosov F., Ploc O., Shurshakov V., Benghin V. A Comparison of the Neutron Dose Measurements Completed by the Bulgarian and Russian Instruments Outside the Zvezda Module of the ISS 99
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Dachev T., Tomov B., Matviichuk Y., Dimitrov P., Semkova J., Jordanova M., Bankov N., Ploc O., Litvak M., Tretyakov V., Shurshakov V., Benghin V. Registration of Neutrons with a Single Detector Liulin Type Spectrometer 109
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Kalinichenko M.M., Kuhai N.V., Konovalenko O.O., Bubnov I.M., Erin S.M., Romanchuk O.I. Giant Ukrainian Radio Telescope as an Instrument for Interplanetary Scintillation Observations 117
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Chapanov Ya. Decadal NAO Oscillations Excited by TSI Cycles 123
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Chapanov Ya., Ron C., Vondrák J. Solar Influence on Seismic Energy 129
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Komitov B., Kaftan V. The Volcanic and Solar Activity Relationship During the Last ~460 Years. Could a Significant Part of the "Sun-Climate" Relationship Go Through Lithosphere? 135
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Komitov B., Kaftan V. The Beech Tree Ring Widths, Solar-Climatic Relationships and Solar Dynamo Regime Changes 141
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Tonev P.T. Observations Supporting Hypothesis for Global Electrical Circuit as Mediator Between Solar Events and Weather 147
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Veretenenko S.V. Effects of Solar Proton Events of January 2005 on Intensity of the Stratospheric Polar Vortex in the Northern Hemisphere 153
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Belakhovsky V.B., Pilipenko V.А., Sakharov Ya.A., Selivanov V.N. The GIC Growth in Electric Power Lines During Magnetic Storm on 7-8 September 2017 159
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Bazilevskaya G.A., Logachev Yu.I., Daibog E.I., Ginzburg E.A., Ishkov V.N., Lazutin L.L., Nguyen M.D., Surova G.M., Vlasova N.A., Yakovchouk O.S. Dynamic of the Occurrence Rate of the Solar Energetic Particle Events During Solar Activity Cycles 21-24 01
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Daibog E.I., Kecskemety K., Logachev Yu.I. Fluxes of Jovian Electrons and Galactic Protons in the Minimum of 23-24 Cycles of Solar Activity 07
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Dechev M.Ts., Koleva K., Duchlev P., Miteva R. Double Filament Eruption and Associated Ribbon Flare and Halo Coronal Mass Ejection 13
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V.N. Ishkov Evolutionary and Flare Characteristics of Prolonged Phases of Solar Minimum 17
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Kilcik A., Ozguc A., Yesilyaprak H., Pektas R. Comparison of FI and the MCMESI for the Last Two Solar Cycles 23
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Kilcik A., Sarp V. Possible Interactions Between Some Solar Activity Indicators for the Last Two Cycles 28
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Krastev K., Semkova J., Koleva R., Bankov N., Benghin V., Drobyshev S. The Shading Effect for Doses and Galactic Cosmic Rays Fluxes Measured by Liulin Instrument, Depending on Liulin-Mars Geometry 31
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Sarp V., Kilcik A. Investigation of Sunspot Area Dynamics in Different Categories 35
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Shevchuk M., Melnik V., Dorovskyy V., Brazhenko A., Frantsuzenko A., Konovalenko A., Poedts S., Magdalenic J. On Polarization of Solar Decameter Spikes 40
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Stanislavsky A.A., Burnecki K., Janczura J., Niczyj K., Weron A. Solar X-ray Variability in Two Distinct States and Its Real-Time Analysis Based on a Fractionally Time-Series Model with a Heteroskedastic Component 44
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Filip Šterc, Darije Maričić, Dragan Roša Morphology of Coronal Hole Based on SDO/AIA Data in May 2010 ÷ December 2013 50
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Tsvetkov Ts., Petrov N., Miteva R., Ivanov E., Popov V. Research on Active Solar Processes During 2019 July 2 Total Solar Eclipse 56
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Krasimira Yankova RS Ophiuchi and Advection 60
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Zagainova Iu.S., Fainshtein V.G., Rudenko G.V. Comparing the Height Dependences of the Magnetic Field Overlying the Initial Areas of Fast and Slow Coronal Mass Ejections 65
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Bojilova R., Mukhtarov P. Global and Regional Response of the Total Electron Content to Geomagnetic Storms Occurred in January 2005 71
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Dachev T., Tomov B., Matviichuk Y., Dimitrov P., Semkova J., Koleva R., Jordanova M., Bankov N., Shurshakov V., Benghin V. Long-Term Variations of the Galactic Cosmic Rays Dose Rates 77
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Derevyagin V.G., Kravetz R.O., Lytvynenko O.A., Panishko S.K. Regular Observations of the Power Cosmic Radio Sources on the Radio Telescope URAN-4. Processing Method, Results Keeping System and Their Applying in Ionosphere Investigations 84
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Despirak I.V., Lubchich A.A., Kleimenova N.G. Supersubstorms, High-Latitude Substorms and Space Weather Conditions 89
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Gromova L.I., Kleimenova N.G., Gromov S.V., Malysheva L.M. Dayside Polar Magnetic Bays Under Different Interplanetary Magnetic Field Direction 95
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Ishkova L.M., Ruzhin Yu.Ya., Bershadskaya I.N. Anomalous TEC Disturbances of the South American Ionosphere Before and After the Main Shocks of Some Powerful Chilean Earthquakes 101
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Kleimenova N.G., Gromova L.I., Gromov S.V., Malysheva L.M. Strong Magnetic Storm on 25-26 August 2018 with Reference to the Solar Cycle 24 Declining 107
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Manninen J., Kleimenova N.G., Gromova L.I., Turunen T. Auroral VLF Hiss as a Signature of the Growth Phase of the Magnetic Substorm 113
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Nikitenko A.S., Lebed O.M., Fedorenko Yu.V., Manninen J., Kleimenova N.G., Gromova L.I., Turunen T. Ground-Based Auroral Hiss: Wave Direction Finding 119
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Shagimuratov I.I., Chernouss S.A., Despirak I.V., Tepenitsyna N.Yu., Filatov M.V., Efishov I.I., Yakimova G.A. TEC Response to the Solar Flare on 6 September 2017 123
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Dashkevich Zh.V., Ivanov V.E. The Nitric Oxide Density in the Polar Region from Ground-Based Photometer Data 129
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Dashkevich Zh.V., Ivanov V.E. The Efficiencies of O(1S) and O(1D) Excitation Mechanisms in Aurora 134
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Kupryakov Yu.A., Dodin A.V., Schwartz P., Kashapova L.K. The Calculation of the Intensity of the Mg I Spectral Lines in Solar Prominences Using the Cloudy Code Model 139
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Sarp V., Kilcik A. State Space Reconstruction for Sunspot Area Time Series 143
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Werner R., Petkov B., Valev D., Guineva V., Atanassov A., Kirillov A. Scheme to Forecast the Local UV-Index Over Bulgaria 147
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Chapanov Ya. ENSO Variations Driven by Solar Cycles, Expressed by N-S Solar Asymmetry 152
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Chapanov Ya. Water Transport and Earth Rotation Variations Due to Solar Cycles 158
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Tonev P.T. Observations Supporting Hypothesis for Global Electrical Circuit as Mediator Between Solar Events and Weather 165
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Dachev T., Dimitrov P., Tomov B., Matviichuk Y., Saganti P., Holland D., Okuyama K.-I., Fajardo I. Analysis of the First Space Radiation Data, Obtained by Liulin Ten-Koh Instrument on the Japanese Ten-Koh Satellite 171
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Bogomolov A.V., Myagkova I.N., Miteva R., Danov D., Kashapova L.K. Parameters of Thermal and Non-thermal X-ray and Gamma Ray Emission of Solar Flares, Observed Onboard CORONAS-F 179
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Kashapova L.K., Meshalkina N.S., Miteva R., Zhukova A.V., Myagkova I.N. Study on the Features of the SEP Solar Origin Based on Microwave Observations 185
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Miteva R., Samwel S.W. Radio Signatures of In Situ Observed ACE/EPAM Electron Fluxes 191
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Miteva R., Samwel S.W., Veronig A., Koleva K., Dechev M., Dissauer K., Temmer M., Kozarev K., Zabunov S. EVE Flare Diagnostics of In Situ Observed Electron Events 196
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Myagkova I.N., Miteva R., Kashapova L., Bogomolov A.V., Danov D. Features of Solar Energetic Particle Events During the 23rd Cycle of Solar Activity and Their Relationship with Solar X-ray, Gamma-Emission and Coronal Mass Ejections 201
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Tsvetkov Ts., Miteva R., Temmer M., Petrov N. STEREOCat Speed De-projection of SEP-Related CMEs 207
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Zhdanov D.A., Kashapova L.K., Myshyakov I.I., Miteva R. About Productivity of the Solar Energetic Particle Events 211
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Podgorny I.M., Podgorny A.I. A Series of Powerful Solar Flares in Minimum of Solar Activity. Proton Acceleration on the Solar Back Side 01
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Duchlev P., Koleva K., Dechev M. Initiation, Interaction and Eruption of Filament Flux Ropes from the Perspective of Their Magnetic Twist and Environment 07
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Zagainova Iu.S., Fainshtein V.G., Gromova L.I., Gromov S.V. Stealth Coronal Mass Ejections: Identification of Source Regions and Geophysical Effects 13
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Koleva K., Duchlev P., Dechev M., Miteva R., Kozarev K., Veronig A., Temmer M. Filament Eruptions Associated with Flares, Coronal Mass Ejections and Solar Energetic Particle Events 19
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Lukashenko A.T., Rodkin D.G., Kaportseva K.B., Shugay Yu.S., Veselovsky I.S., Slemzin V.A. Large-Scale and Small-Scale Structure of Interacting Solar Wind Streams 25
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Krikova K., Utz D., Veronig A., Gömöry P., Hofmeister S., Temmer M. Dynamics and Magnetic Properties in Coronal Holes Using High-Resolution Multi-Instrument Solar Observations 31
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Campos Rozo J.I., Utz D., Veronig A., Vargas Domínguez S. Modelling the Solar Photospheric Plasma and Magnetic Field Dynamics in the Quiet Sun and Comparison of These Results with the Flow Fields in an Evolving Active Region 37
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Yankova K. Advection and Inter-Component Connections in the Quasar 43
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Maričić D., Roša D., Šterc F., Karlica M. Morphology and Geomagnetic Effects of Corotating Interaction Regions in 2008-2014 47
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Kleimenova N.G., Gromova L.I., Gromov S.V., Malysheva L.M. Ground-Based Geomagnetic Signature of the 7-8 September 2017 Magnetic Storm as a Farewell Gift from Solar Cycle 24 55
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Gromova L.I., Kleimenova N.G., Gromov S.V. Interplanetary Conditions Leading to Dayside Magnetic Bays During the Initial Phase of Magnetic Storms 61
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Manninen J., Kleimenova N.G., Fedorenko Yu.V., Gromova L.I., Nikitenko A., Turunen T. Auroral Hiss Events Observed During the Declining Phase of the 24th Solar Cycle at Two Stations Separated by 400 km in Longitude 67
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Kleimenova N.G., Feygin F.Z., Khabazin Yu.G., Malysheva L.M. Unusual Pc1 Geomagnetic Pulsations Observed on the Ground in the End of the 24th Solar Activity Cycle 73
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Guineva V.H., Despirak I.V., Kleimenova N.G. Features of Mid-Latitude Substorms During Large Magnetic Storms 78
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Ishkova L.M., Ruzhin Yu.Ya., Bershadskay I.N. TEC Perturbations of the South American Ionosphere Before and After the Main Shock of the Powerful Chilean Earthquake of 2014 84
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Maris Muntean G., Besliu Ionescu D., Dobrica V. Investigating and Cataloguing High-Speed Streams in the Solar Wind During Solar Cycle 24 (2009–2016) 90
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Asenovski S. Coronal Holes and High-Speed Solar Wind Streams During the 24th Solar Cycle 95
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Miteva R., Danov D. SOHO/ERNE Proton Event Catalog: Progress Results Under the SEP Origin Project 99
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Zhdanov D.A., Kashapova L.K., Miteva R. Results of Comparative Analysis of the SEP Events and the Microwave Bursts Observed by 2-24 GHz and 4-8 GHz Spectropolarimeters in 2010-2016 105
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Myshiakov I., Tsvetkov Ts., Petrov N. Comparison of Kinematics of the Solar Eruptive Prominence and a Spatial Distribution of the Magnetic Decay Index 109
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Myagkova I.N., Miteva R., Kashapova L., Bogomolov A.V., Petrov N., Tsvetkov Ts., Meshalkina N., Myshyakov I. The Efficiency of Solar Energetic Particle Generation: CORONAS-F Mission Data Analysis 114
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Kashapova L., Meshalkina N., Miteva R., Myagkova I., Bogomolov A.V. Analysing of the SEP Origins Based on Microwave Emission of Solar Flares 119
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Sadovnichii V.A., Panasyuk M.I., Lipunov V.M., Bogomolov A.V., Bogomolov V.V., et al. Monitoring of Space Radiation and Other Hazards in Multi-Satellite Project "Universat-SOCRAT" 123
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Yerin S., Stanislavsky A., Bubnov I., Konovalenko A., Tokarsky P., Zakharenko V. Small-Sized Radio Telescopes for Monitoring and Studies of Solar Radio Emission at Meter and Decameter Wavelengths 129
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Kalinichenko M.M., Konovalenko O.O., Brazhenko A.I., Kuhai N.V., Romanchuk O.I. Solar Wind by IPS Observations at Decameter Wavelengths 134
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Miteva R., Belichenova T., Zaharinova M., Mardirossian G., Getsov P. Bulgarian Space Instrumentation 139
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Šterc F., Roša D., Maričić D., Hržina D., Romštajn I., Chilingarian A., Karapetyan T., Cafuta D., Horvat M. SEVAN Particle Detector at Zagreb Astronomical Observatory: 10 Years of Operation 144
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Kirov B., Asenovski S. Results from Langmuir Probe Measurements Aboard the International Space Station 151
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Dashkevich Zh.V., Ivanov V.E., Sergienko T.I., Kozelov B.V. Time Dependent Physicochemical Model of the Auroral Ionosphere 156
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Dashkevich Zh.V., Ivanov V.E. The Effect of Auroral Electron Precipitation on the Effective Recombination Coefficient 162
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Sergeyeva N., Ishkov V., Zabarinskaya L., Nisilevich M. Data on Solar Activity and Interplanetary Medium in WDC for STP 167
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Shkevov R., Erokhin N.S., Loznikov V.M., Zolnikova N.N., Mikhailovskaya L.A. Efficiency Study of Electron Resonance Acceleration by a Wave Packet in Space Plasma 173
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Utz D., Van Doorsselaere T., Gagelmans E., O’Rourke C., Vuerinckx A., Muller R., Veronig A. Long-Term Trends of Magnetic Bright Points: The Evolution of MBP Size 179
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Tonev P.T. Electrical Coupling of Auroral Ionosphere with Lower Atmospheric Regions During SEP 185
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Podgorny I.M., Podgorny A.I. Diagnostics of Solar Flares by Analyzing the Spectral Line Emission of Highly Ionized Iron 01
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Kalinichenko N., Olyak M., Konovalenko A., Brazhenko A., Ivantishin O., Lytvynenko O., Bubnov I., Yerin S., Kuhai N., Romanchuk O. A Method for Reconstructing the Solar-Wind Stream Structure Beyond Earth's Orbit 07
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Melnik V., Brazhenko A., Dorovskyy V., Rucker H., Panchenko M., Frantsuzenko A., Shevchuk M. Decameter Type IV Burst Associated with Behind-Limb CME Observed on November 7, 2013 13
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Miteva R., Samwel S.W., Krupar V. Solar Radio Burst Emission from Proton-Producing Flares and Coronal Mass Ejections 19
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Veselovsky I., Kaportseva K., Lukashenko A. Eight Types of the Solar Wind and Their Origins 24
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Stanislavsky A.A., Konovalenko A.A., Koval A.A., Volvach Ya.S. An Upgrade of the UTR-2 Radio Telescope to a Multifrequency Radio Heliograph 29
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Popova E., Zharkova V., Shepherd S., Zharkov S. On a Role of Quadruple Component of Magnetic Field in Defining Solar Activity in Grand Cycles 34
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Dorovskyy V., Melnik V., Konovalenko A., Brazhenko A., Rucker H. Spatial Properties of the Complex Decameter Type II Burst Observed on 31 May 2013 40
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Ishkov V.N., Zabarinskaya L.P., Sergeeva N.A. The Collection and Compile Data on SPE for the Period 19th-23rd Cycles of Solar Activity 46
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Bojilova R., Mukhtarov P. Influence of Solar and Geomagnetic Activity on the Ionosphere over Bulgaria 54
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Boychev B., Belyaev G., Kostin V., Ovcharenko O., Trushkina E. Features of Upper Ionosphere Modification by Interactive Tropical Cyclones Based on Cosmos-1809 and Interkosmos Bulgaria-1300 Satellite Data 58
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Miteva R., Danov D. On-Line Catalogues of Solar Energetic Protons at SRTI-BAS 66
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Rozelot J.-P., Kosovichev A., Kilcik A. A Look on the Solar Diameter Data Analysis Over the Centuries 70
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Yankova K. Unified Model of the AGN 77
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Yaşar M., Canyilmaz M. The Energy Barrier and Collision Number of O+ + H2(v=0, j=0) Reaction in the Earth Ionosphere 83
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Shagimuratov I., Chernouss S., Despirak I., Filatov M., Efishov I., Tepenitsyna N. Occurrence of TEC Fluctuations and GPS Positioning Errors at Different Longitudes During Auroral Disturbance 86
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Manninen J., Turunen T., Kleimenova N., Rycroft M., Gromova L. Recently Revealed New Type of Daytime VLF Emissions Observed Under Quiet Space Weather Conditions 91
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Ishkova L., Ruzhin Yu., Bershadskaya I. The Large-Scale Ionosphere TEC Disturbances Before Two Power Chilean Earthquakes 97
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Gromova L.I., Gromov S.V., Kleimenova N.G., Dremukhina L.A. Role of the IMF |Bz|/|By| in the Appearance of the Daytime High-Latitude Magnetic Bays 103
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Kleimenova N., Michnowski S., Odzimek A., Kubicki M. Space Weather Effects in Atmospheric Electric Field Variations 109
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Tonev P.T. Transient Variations in Global Electrical Circuit Caused by Different Factors and Their Relation to Cloud Formation 115
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Skokić I., Brajša R., Sudar D., Kuhar M., Benz A.O. Identification of Features in Solar ALMA Images and Comparison with Solar Atmospheric Models 121
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Bárta M., Skokić I., Brajša R. & the Czech ARC Node Team Solar Research with ALMA: Czech Node of European ARC as Your User-Support Infrastructure 127
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Stanislavsky A., Konovalenko A., Koval A., Volvach Ya. Decameter Solar Drift-Pair Bursts 01
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Volvach Ya., Stanislavsky A., Konovalenko A., Koval A. Properties of the Long Drift-Pair Bursts from Decameter Observations of 2015 07
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Kalinichenko N.N., Konovalenko A.A., Brazhenko A.I., Ivantishin O.L., Lytvynenko O.A., Olyak M.R., Bubnov I.N., Yerin S.N. The Investigations of the Interplanetary Scintillations at Decameter Wavelengths: The Present State and Perspectives 11
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Shepeliev V., Melnik V., Brazhenko A., Dorovskyy V., Poedts S., Rucker H. Radio Emission of the Quiet Sun at 20 and 25 MHz According to Interferometer Observations with the UTR-2 Radio Telescope 17
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Melnik V., Shepelev V., Brazhenko A., Dorovskyy V., Rucker H., Poedts S. Interferometer Observations of Solar Type III Bursts by the Radio Telescope UTR-2 23
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Miteva R., Samwel S.W., Costa-Duarte M.V., Danov D. The Online Catalog of Wind/EPACT Proton Events 27
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Krasimira Yankova Relationships in the System Disk - Corona 31
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Despirak I.V., Lubchich A.A., Kleimenova N.G. Magnetic Substorms of Different Types During the 23 and 24 Solar Cycles 35
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Manninen J., Kleimenova N.G., Turunen T., Gromova L.I. Temporal Behaviour of Daytime VLF Emissions Caused by the Solar Wind and IMF Disturbances: A Case Study 39
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Gromova L.I., Kleimenova N.G., Levitin A.E., Dremukhina L.A., Antonova E.E., Gromov S.V. High-Latitude Geomagnetic Effects of Strong Positive IMF Bz: Case Study 43
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Shagimuratov I.I., Chernouss S.A., Filatov M.V., Efishov I.I., Despirak I.V., Kopytenko Yu.A. Fluctuations of GPS Signals and Auroral Activity During 17 March 2015 Geomagnetic Storm 47
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Klimenko M., Klimenko V., Despirak I., Ratovsky K., Zakharenkova I., Korenkova N., Kozelov B., Gomonov A., Vasiliev E., Chernyakov S. Auroral, Geomagnetic and Ionospheric Disturbances During St. Patrick's Day Geomagnetic Storms in 2013 and 2015 53
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Guineva V., Despirak I., Kozelov B. Substorms Over Apatity During 2014/2015 Observational Season 59
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Guineva V., Stoeva P. Basic Results from the Scanning Spectrophotometer “EMO-5” Onboard “IC Bulgaria-1300” 65
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Asenovski S. Heliospheric Current Sheet as a Factor of Geomagnetic Activity Floor 70
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Klimov S., Grushin V., Novikov D., Pilipenko V., Belyakova L., Rodin V., Georgieva K., Kirov B., Ferencz Cs., Szegedi P., Korepanov V., Belyayev S., Marusenkov A., Dudkin D., Pronenko V. Monitoring of Space Weather Electromagnetic Parameters in the Ionosphere. Projects: "Chibis-M”, "Obstanovka (1 Stage)“, “Vernov” 74
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Kleimenova N.G. Are Geomagnetic Disturbances and Pulsations Really Hazardous? 82
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Zelinsky N.R., Kleimenova N.G., Arkhipov R.Y. Application of New Mathematical Methods of Data Processing to Study Solar-Wind-Magnetosphere Interactions: A Case Study 86
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Werner R., Petkov B., Valev D., Atanassov At., Guineva V., Kirillov A. Ozone Determination by GUV 2511 Ultraviolet Irradiation Measurements at Stara Zagora 90
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Podgorny I.M., Minami S., Podgorny A.I. Intercosmos Bulgaria-1300 - Electric Field Generation in the Magnetotail 96
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Podgorny I.M., Podgorny A.I. Solar Cosmic Ray Acceleration and Propagation 01
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Podgorny A.I., Podgorny I.M. Solar Flare Model, MHD Simulations and Comparison with Observations 07
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Kalinichenko N.N., Konovalenko A.A., Brazhenko A.I., Solov\'ev V.V. CME in the Interplanetary Medium by Observations of IPS at the Decameter Wavelengths 15
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Stanislavsky A., Konovalenko A., Koval A., Volvach Ya. CMEs and Frequency Cut-Off of Solar Bursts 19
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Bubnov I.N., Stanislavsky A.A., Konovalenko A.A., Yerin S., Gridin A.A., Koval A.A. Advances in Solar Bursts Observations by the Low-Frequency Radio Telescopes of a New Age 23
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Yankova K. Analysis of the Nonlinear Behavior of the Accretion Flows 25
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Jacobi Ch., Unglaub C., Schmidtke G., Pfeifer M., Schafer R., Brunner R., Woods T., Jakowski N. Delayed Response of Global TEC to Ionization Variations Seen from Combined SolACES-SDO/EVE Solar EUV Spectra 29
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Feygin F.Z., Malysheva L.M., Kleimenova N.G., Khabazin Yu.G. Geomagnetic Pc1 Pulsation Behavior Depending on Solar Activity 33
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Crisan Demetrescu, Venera Dobrica, Cristiana Stefan, Razvan Greculeasa. Geophysically Induced Currents, a Space Weather Hazard: Case Study - Europe Under Intense Geomagnetic Storms of the Solar Cycle 23 37
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Diana Beşliu-Ionescu, Marilena Mierla, Georgeta Maris Muntean. The Influence of April 10, 2001 CME on the Magnetosphere 41
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Kleimenova N.G. Post-Storm High-Latitude Geomagnetic Pc5 Pulsations and VLF Emissions as a Result of Solar Wind Disturbances 45
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Despirak I.V., Lubchich A.A., Kleimenova N.G. Comparison of Substorms During Two Solar Cycles Maximum: (1999-2000 and 2012-2013) 49
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Guineva V., Despirak I.V., Kozelov B.V. Substorms Observations During Two Strongly Disturbed Periods - in March 2012 and March 2015 53
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Kambezidis H.D., Psiloglou B.E., Kavadias K.A., Paliatsos A.G., Bartzokas A. Development of a Greek Solar Map Based on Solar Model Estimations 57
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Mustafa F., Kilcik A., Babayev E., Ozguc A. Cosmic Ray Intensity and Solar Activity Variations: Possible Effects on the Rainfall in Turkey and Azerbaijan and Caspian Sea Level Changes 63
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Tonev P.T. Estimation of Solar Activity Influence on Vertical Extent of Sprites 69
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Mošna Z., Koucka Knížová P., Potužníková K. Coherent Structures in the Es Layer and Neutral Middle Atmosphere 73
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Komitov B., Duchlev P., Kirilova D., Byandov G., Kiskinova N. Annual Tree Rings Widths and the "Sun-Climate" Relationship 77
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Koucká Knížová P., Mošna Z., Kouba D., Potužníková K., Boška J. Tropospheric Systems Influence on the Ionospheric Plasma 80
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Werner R., Valev D., Danov D., Guineva V., Kirillov A. The Atlantic Multidecadal Oscillation Influence on Temperatures and on Structural Changes 84
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Kirillov A.S., Werner R., Guineva V. Kinetics of Electronically Excited O₂ Molecules in the Mixture of CO₂, CO, N₂, O₂ Gases 88
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Samsonov S.N., Kleimenova N.G., Petrova P.G. Geomagnetic Activity Influence on the Seasonal Variations of Myocardial Infarction in Subauroral (Yakutia) and Low Latitudes (Bulgaria) 92
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Gromozova E., Rudenchik E., Ragulskaya M., Obridko V., Hramova E. The Relative Role of Space Weather Factors in Chizhevsky-Velkhover Effect 96
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Shagimuratov I., Chernouss S., Efishov I., Cherniak I., Zakharenkova I., Tepenitsyna N. Development of the GPS TEC Fluctuations at the High Latitude Ionosphere During Geomagnetic Storm 99
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Werner R., Petkov B., Atanassov A., Valev D., Guineva V., Roumenina E., Kirillov A. GUV 2511 Instrument Installation in Stara Zagora and First Results 104
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