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S_q焦点位置的变化特征,并对照K_p、D_(st)、A_p等指数给出了S_q焦点位置变化的合理解释。结果表明:(1)在不同的K_p指数段S_q焦点有不同的规律性。当K_p<4时,随着K_p指数增大,S_q焦点向高纬方向移动;当K_p在4和6之间时,随着K_p指数增大,S_q焦点向低纬方向移动;当K_q>6时,S_q焦点模糊不清。(2)S_q焦点纬度方向上的变化主要由环电流引起,而S_q焦点经度方向上的变化主要由行星际磁场扇形效应影响引起。本文最后还给出了一种新的S_q指数。
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 4<K_p<6, S_qfocus moves to low latitudes as K_pindex is increased; when K_p>6, 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.
出处
《西北地震学报》
CSCD
1993年第4期12-22,共11页
Northwestern Seismological Journal
关键词
Sq焦点
等效电流体系
地磁场
SqFocns
Equivalent Ionosphere Current System
IMF Sector Structure
