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《Chinese Journal of Geophysics》 1990-01
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ANALYSIS ON STRUCTURE OF THE VARIABLE GEOMAGNETIC FIELDS AT MIDDLE AND LOW LATITUDES

Xu WEN-YAO ZHANG MAN-LIAN(Institute of Geophysics, Academia Sinica, Beijing)LING YUN-FANG ZENG XIAO-PING(Institute of Geophysics, State Seismological Bureau, Beijing)  
The data of the variable geomagnetic fields observed at some observatories in China have been analyzed by using the method of Natural Orthogonal Components (MNOC). The separated components of the variable magnetic lields at the middle and low latitudes are: (1) Sq produced by the ionospheric dynamo currents, (2) SD produced by the disturbance currents, and (3) DVT regulated by the universal time UT. The relative magnitudes of these components change with season and their amplitudes have definite latitudinal distributions.
【Fund】: 日地整体行为计划;; 国家自然科学基金
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