THE GEOMAGNETIC DISTURBANCES CAUSED BY SOLAR ACTIVITY IN MARCH 1991
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摘要: 利用北京白家疃台和马道峪台的地磁资料分析了1991年3月下旬太阳活动引起的24-27日的磁暴。从中纬记录看,这次磁暴有其特殊的形态:即急始幅度特别大,磁暴最强活动是急始后即刻开始的极区暴影响而产生的;磁暴过程中多个时段出现脉动,其中以周期为650秒左右的脉动尤为明显;其极化方向主要表现为左族偏振,同时夹有右旋偏振,有时则无明显规律。谱分析的结果表明,整个磁暴功率谱呈幂律P(f)=f-2.0分布。对引起这次磁暴可能的行星际扰动进行了讨论。Abstract: Using the geomagnetic data of Baijiatuan and Madaoyu observatories in Beijing,the magnetic storms of March 24-27 caused by solar activity during the last ten days of March 1991 are analysed. From the records of mid-latitude, one could find the storms have some specific morphological features: the amplitude of the sudden commencement is very large, the most severe activity of the storms is produced by the substorm beginning immediately after the sudden commencement; there appear some pulsations in many intervals during the storms, in particular, the pulsations with T = 650s are outstanding.It is polarization direction displays mainly left-handed,but,it mixed up with right-handed ones without any obvious regularities. The results of spectra analysis indicate that power spectrum p(f) of the whole storm follows the form P(f) = f-2.0. In addition, the interplantary disturbances are discussed,which may cause the storms.
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Key words:
- Magnetic storm /
- Sudden commencement /
- Pulsation /
- Interplanetarystructure /
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