Abstract
AbstractIn this paper, using the data of Sun‐synchronous satellite (Detection of Electro‐Magnetic Waves Transmitted from Earthquake Regions) DEMETER, we investigated the storm time variations of ELF/VLF waves during the intense coronal mass ejections (CME)‐driven storms from 2005 to 2009. The results show that there is a good correlation between the enhancement of ELF/VLF waves and the CME events. Immidately following the enhanced wave activity driven by CMEs at the initial phase, the wave intensity decreases temporarily at the beginning of storm main phase. The strongest waves predominantly occur from the late main phase to early recovery phase. The ELF waves below 3 kHz are significantly intensified during the whole storm time, while the high‐frequency waves above 3 kHz seem strengthened predominantly during the late main and early recovery phase. The ELF waves below 3 kHz can exist in a wide L shell range, with the intensity peaking at L ~ 3 and 4. High‐frequency waves at f > 9 kHz exist mostly outside the plasmapause. The stronger ELF/VLF waves on the dayside can last longer time than those on the nightside.
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