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《Chinese Journal of Geophysics》 1993-04
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UT-VARIABILITY OF THE Sq DYNAMO CURRENT AND ITS GROUND MAGNETIC FIELD RECONSTRUCTION

XU WEN-YAO LI WEI-DONG(Institute of Geophysics, Academia Sinica, Beijing 100101)  
The data of geomagnetic horizontal component H obtained at 7 pairs of stations are used to calculate Sq index, a new geomagnetic index describing the intensity of the Sq dynamo current. Besides remarkable day-to-day variability, UT-variation in Sq index has been found, implying changes both in the total intensity of the Sq dynamo current and in the focus latitude. The ionospheric conductivity and solar tidal wind are principle factors controling the dynamo process in the ionosphere. The Sq variations can be reconstructed using obtained Sq indices and the monthly average X, variation. The reconstructed Sq, being fairly well in agreement with observed ones, show basic behaviours of the day-to-day variability in Sq daily range and some distortions in the Sq pattern.
【Fund】: 国家自然科学基金;; 中国科学院第22周太阳活动峰年日地整体行为研究资助的课题
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