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标题：Annual and semi-annual S q variations at 96° MM MAGDAS I and II stations in Africa
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作者：R. El Hawary ; K. Yumoto ; Y. Yamazaki 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2012
卷号：64
期号：6
页码：425-432
DOI：10.5047/eps.2011.10.013
出版社：Springer Verlag
摘要：The quiet daily variations of the geomagnetic field ( S q) have been studied by using the geomagnetic data of the 10 International Quietest Days.Geomagnetic data from MAGDAS I and II stations—ten stations were selected around the 96° magnetic meridian (MM)—over Africa have been analyzed from September 2008 to August 2009.The analysis of this unique data set clarifies the characteristics of the S q variations over the African sector for the first time by observational geomagnetic data.In this paper, we found that S q( H ) and S q( D ) show a predominantly annual variation.The most interesting result, and a new finding in the African sector, is the appearance of two vortices in the day lit southern hemisphere during spring.Further data analysis also revealed many other interesting characteristics for the S q over the African sector.
关键词：S q ;northward current ;ionospheric currents ;ground-based magnetometers