Dependence of geomagnetic disturbances on extreme values of the solar wind E y component
- 1 April 2007
- journal article
- Published by Pleiades Publishing Ltd in Geomagnetism and Aeronomy
- Vol. 47 (2), 156-164
- https://doi.org/10.1134/s001679320702003x
Abstract
The dependence of the zonal geomagnetic indices (AE, Ap, Kp, Kn, and Dst) on the solar wind parameters (the electric field E y component, dynamic pressure P d and IMF irregularity σB) has been studied for two types of events: magnetic clouds and high-speed streams. Based on the empirical relationships, it has been established that the AE, Ap, Kp, and Kn indices are directly proportional to the E y value at E y < 12 mV m−1 and are inversely proportional to this value at E y > 12 mV m−1 for the first-type events. On the contrary, the dependence of Dst on E y is monotonous nonlinear. A linear dependence of all geomagnetic indices on E y is typical of the second-type events. It has been indicated that the specific features of geoeffectiveness of magnetic clouds and high-speed solar wind streams are caused by the dependence of the electric field potential across the polar cap on the electric field, solar wind dynamic pressure, and IMF fluctuations.Keywords
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