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Features of Increases in the Fluxes of Magnetospheric Electrons with Energies >2 MeV in the Geostationary Orbit in 2009

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Abstract

Increases in the fluxes of magnetospheric electrons with energies >2 MeV in the geostationary orbit and the solar sources of interplanetary disturbances that caused them in 2009 are investigated. Although the year of 2009 was an exceptionally quiet year, increases in the flux of high-energy magnetospheric electrons were observed and divided into groups according to the value of the maximum flux: (I) >500 particles/cm2 s sr, (II) 100–500 particles/cm2 s sr, (III) 10–100 particles/cm2 s sr, and (IV) <10 particles/cm2 s sr. The relationships of the selected increases with the features of interplanetary and geomagnetic disturbances, as well as with their solar sources are analyzed. The connection with individual characteristics of coronal holes, which high-speed streams are the main causes of electron flux increases, is considered in detail. It is shown that the maximum flux of high-energy magnetospheric electrons has a weak correlation with both the area of coronal holes and their magnetic field. The best correlations are found with the maximum velocity of the high-speed stream from the coronal hole and the accompanying geomagnetic and auroral activity, which is consistent with the conclusions of earlier works and indicates a typical behavior of the high-energy electron flux during the anomalously quiet period.

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ACKNOWLEDGMENTS

We are grateful to the developers of the Heliophysics Feature Catalogue (http://voparis-helio.obspm.fr/).

Funding

M.A. Abunina, A.A. Abunin, A.V. Belov, and N.S. Shlyk were supported by the Russian Science Foundation, project no. 20-72-10 023. O.N. Kryakunova, B.B. Seifullina, and I.L. Tsepakina were supported by the Committee of Science of the Ministry of Education and Science of the Republic of Kazakhstan, project no. AR08855916.

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Correspondence to M. A. Abunina.

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Translated by O. Pismenov

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Abunina, M.A., Belov, A.V., Shlyk, N.S. et al. Features of Increases in the Fluxes of Magnetospheric Electrons with Energies >2 MeV in the Geostationary Orbit in 2009. Geomagn. Aeron. 62, 1096–1104 (2022). https://doi.org/10.1134/S0016793222080023

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