1989年3月太阳活动引起的强烈磁暴群

本文分析了1989年3月上旬一个太阳超级活动区中多次特大耀斑引起的强磁暴群.联系源耀斑的等级、位置等讨论了磁暴形态特征.随着耀斑活动区位置由东向西旋转,磁暴的形态呈现有规律的变化,充分显示了磁暴形态特征有依赖于耀斑位置的中心子午线效应和东西不对称性.

The Severe Geomagnetic Storm Group Generated by the Solar Activities in March 1989

Characteristics of the series of severe geomagnetic storms generated by several extraordinarily large solar flares occured in a super active region in March 1989 are analyzed in this paper in association with the location and importance of parent flares. The storm series consisted of at least four independent storms. The most reasonable parent flares for these storms can be selected from the flares with optical improtance equal to or greater than 2B, X-ray classification being X, and duration longer than 1.5 hours. The morphology of geomagnetic storms changed systematically as the flare region rotated from the east to the west of the helio-graphic central meridian, showing obviously the central meridian effect and the east-west asymmetry in the dependence of storm morphology on the flare location.