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Relationship between the fluxes of relativistic electrons at geosynchronous orbit and the level of ULF activity on the Earth’s surface and in the solar wind during the 23rd solar activity cycle

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Abstract

We present the results of a cross-correlation analysis made on the basis of Spearman’s rank correlation method. The quantities to correlate are daily values of the fluence of energetic electrons at a geosynchronous orbit, intensities of ground and interplanetary ultra-low-frequency (ULF) oscillations in the Pc5 range, and parameters of the solar wind. The period under analysis is the 23rd cycle of solar activity, 1996–2006. Daily (from 6 h to 18 h of LT) magnetic data at two diametrically opposite observatories of the Intermagnet network are taken as ground-based measurements. The fluxes of electrons with energies higher than 2 MeV were measured by the geosynchronous GOES satellites. The data of magnetometers and plasma instruments installed on ACE and WIND spacecraft were used for analysis of the solar wind parameters and of the oscillations of the interplanetary magnetic field (IMF). Some results elucidating the role played by interplanetary ULF waves in the processes of generation of magneospheric oscillations and acceleration of energetic electrons are obtained. Among them are (i) high and stable correlation of ground ULF oscillations with waves in the solar wind; (ii) closer link of mean daily amplitudes of both interplanetary and ground oscillations with ‘tomorrow’ values of the solar wind velocity than with current values; and (iii) correlation of the intensity of ULF waves in the solar wind, normalized to the IMF magnitude, with fluxes of relativistic electrons in the magnetosphere.

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Authors and Affiliations

  1. Institute of Solar-Terrestrial Physics, Siberian Branch of Russian Academy of Sciences, Irkutsk, Russia

    A. S. Potapov & B. Tsegmed

  2. Research Center for Astrophysics and Geophysics, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia

    B. Tsegmed

  3. Irkutsk State Technical University, Irkutsk, Russia

    L. V. Ryzhakova

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  1. A. S. Potapov
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  2. B. Tsegmed
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  3. L. V. Ryzhakova
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Correspondence to A. S. Potapov.

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Original Russian Text © A.S. Potapov, B. Tsegmed, L.V. Ryzhakova, 2012, published in Kosmicheskie Issledovaniya, 2012, Vol. 50, No. 2, pp. 130–146.

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Potapov, A.S., Tsegmed, B. & Ryzhakova, L.V. Relationship between the fluxes of relativistic electrons at geosynchronous orbit and the level of ULF activity on the Earth’s surface and in the solar wind during the 23rd solar activity cycle. Cosmic Res 50, 124–140 (2012). https://doi.org/10.1134/S0010952512020086

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