A comprehensive analysis of the geomagnetic storms occurred during 18 February and 2 March 2014

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• 作者：Essam Ghamry ; Ahmed Lethy ; Tareq Arafa-Hamed ; Esmat Abd Elaal
• 关键词：Geomagnetic storms ; Pi2 and Pc4 pulsations ; Interplanetary shocks
• 刊名：NRIAG Journal of Astronomy and Geophysics
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：5
• 期：1
• 页码：263-268
• 全文大小：1403 K

文摘

The Geomagnetic storms are considered as one of the major natural hazards. Egyptian geomagnetic observatories observed multiple geomagnetic storms during 18 February to 2 March 2014. During this period, four interplanetary shocks successively hit the Earth’s magnetosphere, leading to four geomagnetic storms. The storm onsets occurred on 18, 20, 23 and 27 February. A non-substorm Pi2 pulsation was observed on 26 February. This Pi2 pulsation was detected in Egyptian observatories (Misallat and Abu Simbel), Kakioka station in Japan and Carson City station in US with nearly identical waveforms. Van Allen Probe missions observed non-compressional Pc4 pulsations on the recovery phase of the third storm. This Pc4 event is may be likely attributed to the decay of the ring current in the recovery phase.