| 我国中低纬度地区Sq焦点的分析与研究 |
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| 引用本文： | 熊先宝,钱家栋,徐文耀.我国中低纬度地区Sq焦点的分析与研究[J].西北地震学报,1993,15(4):12-22. |
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| 作者姓名： | 熊先宝 钱家栋 徐文耀 |
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| 作者单位： | 国家地震局兰州地震研究所
(熊先宝，钱家栋)，中国科学院地球物理研究所(徐文耀) |
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| 摘 要： | 本文利用１９８８年３月－１９８９年３月几次大的太阳活动期间我国９个台站的地磁资料，采用无穷大平板电流的等效电流体系方法，分析了我国中低纬度地区Ｓｑ焦点位置的变化特征，并对照ＫｐＤｓｔ，Ａｐ等指数给出了Ｓｑ焦点位置变化的合理解释。结构表明：（１）在不同的Ｋｐ指数段Ｓｑ焦点有不同的规律性，当Ｋｐ＜４时，随着Ｋｐ指数增大，Ｓｑ焦点向高纬方向移动；当Ｋｐ在４和６之间时，随着Ｋｐ指数增大，Ｓｑ焦点向低纬方向
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| 关 键 词： | Sq焦点 等效电流体系 地磁场 |
ANALYSIS AND RESEARCH OF SqFOCUS POSITION OF THE MID-LOW LATITUDES IN CHINA |
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| Xiong Xianbao,Qian Jiadong and Xu Wenyao.ANALYSIS AND RESEARCH OF SqFOCUS POSITION OF THE MID-LOW LATITUDES IN CHINA[J].Northwestern Seismological Journal,1993,15(4):12-22. |
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| Authors: | Xiong Xianbao Qian Jiadong and Xu Wenyao |
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| Institution: | Earthquake Research Institute of Lanzhou, SSB, China,Earthquake Research Institute of Lanzhou, SSB, China and Institute of Geophysics, Academia Sinica, Beijing, China |
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| Abstract: | Using the geomagnetic data of several great solar activities from Mar. 1988 to Mal. 1989 of 9 stations in China, and the equivalent ionosphere current systems of infinite plate current, we analysed the variation features of S_qfocus position of the mid-low latitudes in China and obtained reasonable explanation of S_qfocus variability corresponding to K_p, D_st, A_pindexes. It is showed that 1) In different K_pindex intervals, S_qfocus has different regularities. When K_p<4, S_qfocus moves to high latitudes as K_pindex is increased; When 46, S_qfocus is indistinct as K_pindex is increased.2) S_qfocus variation along latitude direction was mainly caused by ring currents, but variation along longitudinal direction was mainly affected by IMF sector effect. |
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| Keywords: | SqFocns Equivalent Ionosphere Current System IMF Sector Structure |
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