SUBSTORMS CAUSED BY LARGE-AMPLITUDE SOLAR WIND DYNAMIC PRESSURE PULSES: CASE STUDY ON 3 NOVEMBER 2021

L.I. Gromova,N.G. Kleimenova,I.V. Despirak,S.V. Gromov,L.M. Malysheva,A.A. Lubchich

PHYSICS OF AURORAL PHENOMENA（2023）

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Abstract

We studied the geomagnetic effects of abrupt and large-amplitude changes in the solar wind dynamic pressure (Psw) on 3 November 2021. when there were observed three large-amplitude Psw pulses (up to 20 nPa) under the strong (up to −18 nT) southward IMF Bz and significantly varying IMF By (from +20 to −15 nT). Basing on IMAGE magnetometer data, we found three substorms associated with these Psw impulses. These substorms followed one after another with a short interval and each subsequent substorm began developing during the unfinished recovery phase of the previous one under disturbed space weather conditions. Under strong negative IMF Bz there was significant input of energy into the magnetosphere that indicated by the increasing PC-index values. It was shown that the spatial-temporal features of the substorm subsequence development was complicated, differed from a typical isolated “normal” substorm and changed from one substorm to another. According to the AMPERE 66 ionospheric satellite data, the global distribution of the ionospheric and field-aligned currents (FAC) was established during the considered substorms. We found that during all these substorms, there were strong FACs and corresponding ionospheric electrojets in the morning sector indicating an enhanced magnetospheric convection which formed the DP2 current system. In addition, in the night sector, the DP1 current system was observed, the clearest in the second event.

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【要点】：本文研究了2021年11月3日由大振幅太阳风动态压力脉冲引起的磁暴效应，发现了与这些压力脉冲相关联的三次 substorm，这些 substorm 在恶劣的空间天气条件下，一个接一个地发生，每个 substorm 的发展都始于前一个未完成的恢复阶段。

【方法】：研究基于IMAGE磁力计数据，分析了与大振幅太阳风动态压力脉冲相关的 substorm 活动。

【实验】：通过分析2021年11月3日的事件，发现三次 substorm 与大振幅的太阳风动态压力脉冲有关，这些 substorm 在恶劣的空间天气条件下连续发生，每个 substorm 的发展都始于前一个未完成的恢复阶段。使用IMAGE磁力计数据和AMPERE 66离子层卫星数据分析了 substorm 期间离子层和场向电流的全球分布。