Abstract
Measurements by the world network of neutron monitors during the period 1996–2018 31 are used to identify strong Forbush decreases (>5%) that meet the accepted criteria for event selection. Coordinated spatial distributions of solar wind parameters and drops in the density of cosmic rays are determined via epoch superimposition. It is established that contributions from the mechanisms of the formation of Forbush decreases differ greatly in two groups of events. This difference could be due to Forbush decreases forming in the front of one group and the peripheral part of the disturbance forming in the other group.
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ACKNOWLEDGMENTS
The authors are grateful for the FD database obtained by the IZMIRAN Cosmic Ray Research Group (http://spaceweather.izmiran.ru/eng/dbs.html), the NMDB database (www.nmdb.eu), OMNIWeb (https://omniweb.gsfc.nasa. gov/form/dx1.html), database of near-Earth interplanetary coronal mass ejections compiled by Richardson and Kane (http://www.srl.caltech.edu/ACE/ASC/DATA/level3/icmetable2.htm) and the Wind ICME catalog (https://wind.nasa. gov/ICME_catalog). /ICME_catalog_viewer.php).
Funding
This work was supported by the RF Ministry of Science and Higher Education, and by the Siberian Branch of the Russian Academy of Sciences, project no. FWRS-2021-0012.
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Translated by G. Dedkov
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Petukhova, A.S., Petukhov, I.S. & Petukhov, S.I. Efficiency of Mechanisms for the Formation of Sporadic Forbush Decreases. Bull. Russ. Acad. Sci. Phys. 87, 965–967 (2023). https://doi.org/10.3103/S1062873823702532
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DOI: https://doi.org/10.3103/S1062873823702532