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《Chinese Journal of Geophysics》 1994-02
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LONGITUDINAL EFFECTS AND UT VARIATIONS OF THE GEOMAGNETIC S_q FIELD

XU WEN-YAO; LI WEI-DONG (Institute of Geophysics, Academia Sinica, Beijing 100101 )  
The longitudinal effects and UT variations of the geomagnetic Sq field have been analysed on the basis of the magnetic data from the world station network during IGY/C(1957.7-1959.12).The data at 4 observatories in China are included in analysis. A new scheme has been proposed for analysing Sq field which combines the Spheric harmonic analysis and biharmonic analysis. The Sq field has been separated into 3 parts: SLT dependent on local time LT alone, SUT on universal time UT alone, and SLUT on both LT and UT.In globle scale, the ratios of the intensities of the three parts are 1.0:0.2:0.3 for X component, 1.0:0.1:0.6 for Y component,1.0:0.4:1.0 for Z Component. The longitudinal effects of the Sq field and its UT variations have different forms,although they show the same phenomenon.The longitudinal effects and UT variations of the Sq field are attributed to the tilt of the geomagnetic axis,non-diple fields in the earth's magnetic field(regional anomalies),and lateral inhomogeneous conductivities in the crust and the mantle.
【Fund】: 国家自然科学基金 中国科学院资助
【CateGory Index】: P318
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