Search Publications
Criteria for Forecasting Proton Events by Real-Time Solar Observations
Struminsky, A. B.; Grigorieva, I. Yu.; Sadovskii, A. M.
The sequence for overcoming the threshold values of a number of physical characteristics for proton event forecasting in real time is discussed. Each characteristic adds a new physical meaning that refines the forecast. To take into account all the characteristics, the following continuous patrol observations are necessary: (1) the magnetic field …
On Possible Additional Sources of Solar Protons in the Events of September 4–10, 2017
Struminsky, A. B.; Grigor'eva, I. Yu.; Ozheredov, V. A.
The article considers the period from September 4 to September 10, 2017, inclusive, during which the last proton events of solar cycle 24 occurred. In order to detect possible additional proton sources and verify the sources already listed in various catalogs, we apply an empirical method for predicting proton events to all solar flares detected d…
Study of Sudden Magnetic Storm Commencement from Observations with Second Time Resolution
Fainshtein, V. G.; Gromova, L. I.; Gromov, S. V. +1 more
The article presents the results of a studying detection of the sudden commencement (SC) and main impulse (MI) of a magnetic storm as a function of the geographic coordinates of magnetic observatories and Universal Time, using modern data with second time resolution. The analysis was carried out for two events in which an interplanetary shock wave…
Influence of Processes on the Sun and in the Interplanetary Medium on the Solar Proton Event on March 30, 2022
Vlasova, N. A.; Bazilevskaya, G. A.; Ginzburg, E. A. +5 more
The article presents the results of a comparative analysis of the solar proton event on March 30, 2022, which has an unusual time profile of solar proton fluxes, and the previous and subsequent solar proton events (March 28, 2022, and April 02, 2022). Increases in energetic proton fluxes in the interplanetary and near-Earth space are associated wi…
Cyclical Variations of Meridional Flows on the Sun
Bilenko, Irina A.
Based on a large volume of observational data of magnetic fields obtained at both ground-based and space observatories, cyclical variations of the meridional flows of the solar magnetic fields in 21–25 cycles of solar activity are considered. It is shown that magnetic fields of medium strength of different polarities form oppositely directed magne…
Prolonged, Weak C1.2 Flares: A Source of Protons and Electrons
Struminskii, A. B.; Grigor'eva, I. Yu.; Shakhovskaya, A. N.
Two proton events (>100 MeV; GOES, ACS SPI) associated with weak flares (C1.2, GOES class) in the soft X-ray range that occurred on November 26, 2011, and September 29, 2013, are analyzed. These events were accompanied by significant fluxes of relativistic electrons (>1 MeV; SOHO EPHIN) in the interplanetary space. The time profiles of these…
Formation and Evolutionary Changes of Coronal Holes in the Growth Phase of Cycle 23
Bilenko, I. A.; Tavastsherna, K. S.
The regularities in the formation of coronal holes in the growth phase of cycle 23 are studied. The period from January 1, 1997, to March 1, 2000 (Carrington rotations 1918–2059), is considered in detail. The evolution of the global magnetic field of the Sun from a zonal to a sectorial structure of the field distribution is analyzed. The zonal str…
Features of Slow Sunspot Dissipation
Solov'ev, A. A.; Zhivanovich, I.
According to a model of sunspot dissipation through a thin boundary layer between the sunspot magnetic flux tube and the surrounding medium, the rate of decrease in the sunspot area must slow as the spot size decreases until it reaches a critical threshold at which the linear law of sunspot dissipation gives way to a nonlinear one. This theoretica…
Search for the Relationship between the Velocity of a Coronal Mass Ejection and the Decay Rate of the Magnetic Field in the Region of Mass Emission Generation
Fainshtein, V. G.; Rudenko, G. V.; Zagainova, Yu. S.
In this paper, we search for the relationship between the Vlin linear projection velocity and the Vss velocity in the 3D space of coronal mass ejections (CMEs) recorded by LASCO coronagraphs with an "n" decay rate of the transverse component of the Bt magnetic field above the polarity inversion line (PIL) of the ph…
New method for separating K- and F-corona brightness based on LASCO/SOHO data
Fainshtein, V. G.
A relatively simple (in technology) method for separating K- and F-corona brightness based on LASCO data, which makes it possible to obtain the latitude distribution of this brightness in the field of view of the LASCO C2 and C3 coronographs at any instant for which white light corona images are available, has been proposed. It has been estimated …