An increase in Pc1 wave activity prior to magnetic sudden impulses

被引：6
|
作者：
Guglielmi, A
Kangas, J
Kultima, J
Potapov, A
机构：
[1] United Inst Phys Earth, Moscow 123810, Russia
[2] Sodankyla Geophys Observ, FIN-99600 Sodankyla, Finland
[3] Ins Solar Terr Phys, Irkutsk 664033, Russia
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2000年 / 105卷 / A11期
关键词：
D O I：
10.1029/2000JA900089
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The enhancement of Pc1 wave activity after magnetic sudden impulses (SIs) is well established by ground-based and satellite measurements. This phenomenon is explained by compressions of the magnetosphere under the action of interplanetary shocks. In this paper we use long-term ground-based observations of Pc1 to study the variation of the Pc1 wave activity before SIs. We conclude that there is a tendency for an increase of the rate of Pc1 occurrence as the time gets closer to the SI. We interpret this effect as an impact of the interplanetary foreshocks on the Earth's magnetosphere.
引用
收藏
页码：25185 / 25189
页数：5
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