Abstract
The geoeffectiveness of single and complex transient structures of the solar wind (SW), formed by coronal mass ejections (CMEs) and associated Forbush decreases (FDs) in the cosmic ray flux is considered. By the example of the period of 2010–2011, it is shown that complex SW structures resulting from the interaction of CMEs with high-speed streams from coronal holes or with other CMEs in the heliosphere more often lead to moderate and strong geomagnetic storms (Dst < –50 nT) in comparison with single CMEs. It is shown that the FD increases with the growth of the SW transient structure duration and the average magnitude of the interplanetary magnetic field of the transient and takes the highest values when the complex structures arrive at the Earth.
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This work was supported by the Russian Science Foundation, project no. 17-12-01567.
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Translated by A. Kazantsev
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Rodkin, D.G., Slemzin, V.A. & Shugay, Y.S. Geomagnetic Storms and Forbush-Decreases Related to Single and Complex Transient Structures of Solar Wind. Bull. Lebedev Phys. Inst. 47, 92–96 (2020). https://doi.org/10.3103/S1068335620030069
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DOI: https://doi.org/10.3103/S1068335620030069