Observation of low frequency electromagnetic activity at 1000 km altitude

被引：13

作者：

Ivchenko, N ^{[1
]}

Marklund, G ^{[1
]}

机构：

[1] Royal Inst Technol, Alfven Lab, Stockholm, Sweden

来源：

ANNALES GEOPHYSICAE | 2001年 / 19卷 / 06期

关键词：

ionosphere; auroral ionosphere; space plasma physics; waves and instabilities; magnetospheric physics; magnetosphere-ionosphere interactions;

D O I：

10.5194/angeo-19-643-2001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a statistical study of low frequency fluctuations of electric and magnetic fields, commonly interpreted as Alfvenic activity. The data base consists of six months of electric and magnetic field measurements by the Astrid-2 microsatellite. The occurrence of the events is studied with respect to the location and general activity. Large regions of broadband Alfvenic activity are persistently observed in the cusp/cleft and, during the periods of high geomagnetic activity, also in the pre-midnight sector of the auroral oval.

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收藏

页码：643 / 648

页数：6

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