On the plane wave approximation of the external geomagnetic field in regional induction studies

被引:0
|
作者
Ernst, T [1 ]
Jankowski, J [1 ]
机构
[1] Polish Acad Sci, Inst Geophys, PL-01452 Warsaw, Poland
关键词
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中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In interpreting geomagnetic and magnetotelluric sounding results, it is usually assumed that the external field inducing currents within the Earth can be approximated at middle geomagnetic latitudes by a plane wave vertically incident on the Earth's surface. Using data from eight European observatories, we analyzed the correctness of this assumption depending on the magnetic activity and geomagnetic latitude. Our analysis shows that, in many cases, this assumption is invalid. Therefore, it seems appropriate to preliminarily select data for their subsequent analysis.
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页码:363 / 370
页数:8
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