Substorm activity during the main phase of magnetic storms induced by the CIR and ICME events

Abstract In this work, the relation of high-latitude indices of geomagnetic activity (AE, Kp) with the rate of storm development and a solar wind electric field during the main phase of magnetic storm induced by the CIR and ICME events is investigated. 72 magnetic storms induced by CIR and ICME events have been selected. It is shown that for the CIR and ICME events the increase of average value of the Kp index (Kp aver ) is observed with the growth of rate of storm development. The value of Kp aver index correlates with the magnitude of minimum value of Dst index (|Dst min |) only for the ICME events. The analysis of average values of AE and Kp indices during the main phase of magnetic storm depending on the SW electric field has shown that for the CIR events, unlike the ICME events, the value of AE aver increases with the growth of average value of the electric field (Esw aver ). The value of Kp aver correlates with the Esw aver only for the ICME events. The relation between geomagnetic indices and the maximum value of SW electric field (Esw max ) is weak. However, for the ICME events Kp aver correlates with Esw max .