Search Publications
Solar Energetic Proton Fluxes in Near-Earth Space on March 13-23, 2023
Vlasova, N. A.; Bazilevskaya, G. A.; Ginzburg, E. A. +5 more
The results of studying the fluxes of solar protons with energies greater than 5 MeV in near-Earth space on March 13-23, 2023, are presented. The features of the period under study are no visible solar flare with which the beginning of the event could be associated and an untypical time profile of proton fluxes, as well as a long duration of the e…
Earth's Ionospheric Response to Solar Activity Phenomena in February-March 2023
Sheiner, O. A.; Vybornov, F. I.
As a result of the analysis of data from vertical and oblique sounding of the ionosphere in February-March 2023 using the new ionospheric index, it was found that solar coronal mass ejections (CMEs) of the loop type lead to a long-term decrease in the critical frequencies F-layer of the ionosphere, while other types of CMEs may not lead to signifi…
Catalogs of Solar Proton Events as a Tool for Studying Space Weather
Vlasova, N. A.; Bazilevskaya, G. A.; Ginzburg, E. A. +8 more
Distinguishing features of a series of solar proton event (SPE) catalogs for the 20th-24th cycles of solar activity are described. The results of a comparative analysis of the 23rd and 24th cycles of solar activity performed according to the data of a series of SPE catalogs are presented. The opportunities provided by SPE catalogs for studying spa…
Use of the DBM Model to the Predict of Arrival of Coronal Mass Ejections to the Earth
Kaportseva, K. B.; Shugay, Yu. S.
This paper analyzes the results of modeling coronal mass ejection (CME) propagation in 2010-2011 obtained using input data from different sources: CME catalogs SEEDS and CACTus, and predictions of the velocity of quasi-stationary solar wind fluxes, as an environment, through which CMEs propagate. As the model of quasi-stationary solar wind fluxes,…
Some Features of Solar Proton Events on March 7, 2011, and on February 20, 2014
Vlasova, N. A.; Kalegaev, V. V.; Tulupov, V. I.
The paper presents the results of studying two solar proton events—on March 7, 2011, and on February 20, 2014—which are associated with solar flares having almost the same power and located at close heliolongitudes, on the western side of the solar disk. The work was done on the basis of the experimental data obtained from the ACE spacecraft and t…
Disturbed Flows in the Inner Solar Wind and Near Earth's Orbit
Pätzold, M.; Bird, M. K.; Efimov, A. I. +3 more
Coronal mass ejections from active regions on the Sun can be observed as series of individual events separated in time in the inner solar wind and near-Earth plasma. To find such events we have analyzed experimental data of dual-frequency solar wind radio sounding by the Rosetta and Mars Express spacecraft. The cycles of experiments performed in 2…
Observation of Disturbed Plasma Structures in the Environment of the Sun and Near-Earth Space with Radio Sounding and Local Measurements
Bird, M. K.; Efimov, A. I.; Lukanina, L. A. +3 more
An experiment on radio sounding of the circumsolar plasma by signals from the Mars Express spacecraft in 2013 was carried out in the period from March 4 through May 31. The investigated characteristics were the frequency of signals in the centimeter and decimeter ranges and the differential frequency. A number of events were recorded in which the …
Physical Mechanism of a Solar Flare Based on the Accumulation of the Energy in the Magnetic Field of the Current Sheet in the Solar Corona
Podgorny, I. M.; Podgorny, A. I.
During a solar flare, the magnetic energy of ~1032 erg is released in a few dozens of minutes. The invariability of the magnetic field on the solar surface during flares proves the appearance of a flare in the corona. An analysis of the dynamics of the electron temperature of the solar atmosphere provides independent evidence of the cor…
Comparing the Features of Generation of CMEs Moving with Different Speed in the Field of View of the LASCO Coronagraphs
Fainshtein, V. G.; Zagainova, Yu. S.
This study is aimed at finding an answer to the following question: are there any fundamental differences in the generation of coronal mass ejections (CMEs) with different speeds, especially low and high speeds, detected in the field of view of LASCO coronagraphs? Fast CMEs are conventionally understood as mass ejections with a linear projection v…
Peculiarities of long-wave radio bursts from solar flares preceding strong geomagnetic storms
Yermolaev, Yu. I.; Kudela, K.; Prokudina, V. S. +2 more
Radio bursts in the frequency range of 100-1500 kHz, recorded in 1997-2000 on the INTERBALL-1 satellite during the solar flares preceding the strong geomagnetic storms with D st < -100 nT, are analyzed in this paper. The observed long-wave III-type radio bursts of solar origin at frequencies of 1460 and 780 kHz were characterized b…