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《Chinese Journal of Space Science》 1987-02
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Estimation ofq■, Current System Focus by Means of Geomagnetic Data at Middle and Low Latitudes

Xu Wen-yao(Institute of Geophysics, Academia Sinica)  
The relationship of geomagnetic field at the earth's surface with Sqe current systems is analysed. It is pointed out that there exsist some differences between the true focus of the Sqe current system and the "apparent focus" determined by using Sqe variations in the geomagnetic field at the earth's surface. Practical approaches to estimating Sqe current focus by means of geomagnetic data are discussed and examined by using geomagnetic data during the period of IGY/C.
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