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SARS-CoV-2 Pandemic as a Predator–Prey System: Biophysical, Social and Heliophysical Factors of the Spread of Local Epidemics
AbstractThis paper considers the features of the development of the coronavirus pandemic in various countries within the framework of the...
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Solar Activity
Before proceeding to the description of the phenomena of solar activity (SA), it is necessary at least briefly to get acquainted with the structure...
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Activity Complexes and Coronal Holes on the Sun: Relationship Phenomenology
AbstractThe relationship between activity complexes (ACs) and coronal holes (CHs) is analyzed according to the data of the 24th cycle of solar...
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Monitoring Space Weather with a System of Ground-Based Cosmic Ray Detectors
AbstractFlicker noise spectroscopy is developed for the remote identification of processes of powerful solar activity in the form of coronal mass...
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Group Sunspot Numbers: A New Reconstruction of Sunspot Activity Variations from Historical Sunspot Records Using Algorithms from Machine Learning
Historical sunspot records and the construction of a comprehensive database are among the most sought after research activities in solar physics....
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“Generative” Indices of Sunspot Solar Activity: 145-Year Composite Series
Traditional indices, which we call apparent indices, describe the current state of solar activity and are very important for understanding the...
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Temporal and Periodic Analysis of Penumbra–Umbra Ratio for the Last Four Solar Cycles
We investigate the long-term dynamic behavior of the sunspot penumbra to umbra area ratio by analyzing the Debrecen Photoheliographic Data (DPD) of...
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Sunspots Identification Through Mathematical Morphology
The implementation of automated methods for sunspot detection is essential to obtain better objectivity, efficiency, and accuracy in identifying...
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Solar Flares and Their Terrestrial Manifestations
AbstractThe paper is an overview about the phenomenon of solar–terrestrial connections. The influence of various types of solar activity on processes...
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Sunspots, Solar Flares, and Coronal Partings
AbstractThe paper presents an overview describing the main types of solar activity: sunspots, faculae, flares, coronal mass ejections, coronal holes,...
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Cosmic-Ray Variations in 2021 According to Observation Data of the Experimental Complex of Eurasian National University
AbstractIn this paper, variations of secondary cosmic rays are studied together with variations in the characteristics of the surface electric field...
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A Telescope for Imaging the Sun on Board CubeSat Small Spacecraft
Abstract—A small space telescope intended for imaging the Sun on board CubeSat small spacecraft has been developed and produced in the form of a...
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A Sunspot Catalog by Rafael Carrasco at the Madrid Astronomical Observatory for the Period 1931 – 1933
A sunspot catalog was published by the Madrid Astronomical Observatory from sunspot observations made by Rafael Carrasco and his assistants for the...
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The Endurance Rocket Mission
NASA’s Endurance sounding rocket (yard No. 47.001) will launch from Ny Ålesund, Svalbard in May 2022 on a solid fueled Oriole III-A launch vehicle....
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Variations in the Mid-Latitude Ionosphere Parameters over Ukraine during the Very Moderate Magnetic Storm on December 18, 2019
AbstractMultiyear researches show that weak and moderate magnetic storms may induce considerable and unpredictable changes in the ionosphere state....
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Variations in Cosmic Rays before Powerful Earthquakes
AbstractIt is found that variations in cosmic ray fluxes are observed before powerful earthquakes (magnitude M ≈ 8) at most neutron monitors of the...
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The Sun
Our Sun is the only star whose surface we can study in detail due to its proximity. Through space missions are also in situ measurements possible.
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Hemispheric Asymmetry in the Sunspot Cycle as a Nonextensive Phenomenon
The appearance of dark sunspots over the solar photosphere is not considered to be symmetric between the northern and southern hemispheres. Among the...
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Cyclical Behaviors of Sunspot-Group Tilt Angles in Solar Cycles 21 – 23
Based on the Debrecen Photoheliographic Data (DPD) sunspot catalog, we investigate the cyclical behaviors of tilt angles of all sunspot groups (SGs)...
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On the fractal properties of cosmic rays and Sun dynamics cross-correlations
We investigate the cosmic rays and ten physical parameters of heliosphere behavior considering the scaling features of their temporal evolution. Our...
