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Dynamics of the ring current–magnetotail currents relationships during geomagnetic storms of different intensity

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Abstract

The results of studying the intensity of fluxes of 30–80 keV ions from the data of measurements of the NOAA (POES) sun-synchronous satellites during geomagnetic storms of different intensity are presented. For 15 geomagnetic storms with |Dst|max from ~37 to ~422 nT, the storm-time maximum ion fluxes in the near-equatorial region (trapped particles) and at high latitudes (precipitating particles) have been considered. It is shown that the maximum fluxes of trapped particles, which are considered a ring-current proxy, increase with the storm power. In this case, if a smooth growth of fluxes is recorded for storms with |Dst|max < 250 nT in the near-equatorial region, a significantly steeper growth of fluxes of trapped particles is observed when storm power increases during storms with |Dst|max > 250 nT. This may be evidence of both an increasing of the contribution of the ring current relative to magnetotail currents to the development of high-intensity storms and to a nonlinear link between the ring current and ion fluxes at low altitudes in the near-equatorial region. Despite large variations in fluxes of precipitating particles in the polar region above the boundary of isotropization, a decreasing tendency, as a whole, in fluxes of these particles is observed with increasing the storm intensity. This is the evidence of the effect of saturation of magnetotail currents and of an increase in the relative role of the ring current during strong magnetic storms.

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Authors and Affiliations

  1. Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991, Russia

    V. V. Kalegaev & N. A. Vlasova

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  1. V. V. Kalegaev
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  2. N. A. Vlasova
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Correspondence to V. V. Kalegaev.

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Original Russian Text © V.V. Kalegaev, N.A. Vlasova, 2017, published in Geomagnetizm i Aeronomiya, 2017, Vol. 57, No. 5, pp. 572–577.

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Kalegaev, V.V., Vlasova, N.A. Dynamics of the ring current–magnetotail currents relationships during geomagnetic storms of different intensity. Geomagn. Aeron. 57, 529–534 (2017). https://doi.org/10.1134/S0016793217040089

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