Abstract
Forbush decreases occurring from 1997 to 2017 (1055 events in total) have been analyzed with the use of a database of Forbush effects and interplanetary disturbances built and currently maintained by the Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Russian Academy of Sciences (IZMIRAN). Based on statistical methods, we compared the temporal evolution of Forbush decreases in events of four types: (1) those associated with coronal mass ejections from active regions and accompanied by solar flares; (2) those induced by interplanetary disturbances due to filament eruptions from areas beyond active regions; (3) those caused by high-speed streams from coronal holes; and (4) those associated with two or more sources of different types of disturbances. In the comparison, we used the following time parameters of the development of Forbush decreases: the time intervals from the event onset to the detection of the minimal density of cosmic rays, the maximal hourly decrease in the density of cosmic rays, the maximal equatorial anisotropy of cosmic rays, the maximal speed of the solar wind, the maximal strength of the interplanetary magnetic field, and the minimal Dst index. Analysis of the distributions of the time parameters and their intercorrelation has shown that there are substantial differences between the evolution scenarios of Forbush decreases in the four sets of examined events.
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ACKNOWLEDGMENTS
The authors are grateful to the teams of the worldwide network of cosmic-ray stations for access to data from the continuous monitoring of the neutron component (http://cr0.izmiran.ru/ThankYou/Our_Acknowledgment.pdf) and to the team maintaining the NMDB database (www.nmdb.eu). The study was based on experimental data obtained by the Unique Research Facility of the Russian National Network of Cosmic Ray Stations (CRS Network).
Funding
M.A.A., A.A.A., A.V.B., and N.S.S. acknowledge the support of the Russian Science Foundation (grant no. 20-72-10 023).
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Melkumyan, A.A., Belov, A.V., Abunina, M.A. et al. Features of the Behavior of Time Parameters of Forbush Decreases Associated with Different Types of Solar and Interplanetary Sources. Geomagn. Aeron. 62, 17–31 (2022). https://doi.org/10.1134/S0016793222010133
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DOI: https://doi.org/10.1134/S0016793222010133