由环电流的宇宙线效应验证二维对称环电流模型

CHECKING TWO-DIMENSIONAL SYMMETRIC MODEL OF RING CURRENT BY THE EFFECTS OF EQUATORIAL RING CURRENTS ON COSMIC RAY

本文利用不同纬度超中子堆记录的宇宙线强度,对不同磁暴类型下环电流的宇宙线效应进行了分析。加强的西向环电流使宇宙线截止刚度下降,在某些特大的磁暴中,中低纬字宙线截止刚度下降可达1GV以上,从而使宇宙线强度增加。利用二维对称环电流模式,从宇宙线的角度计算了环电流的磁暴效应。与实际观测值的对比显示,除非特大的磁暴过程,利用该模式所得结果与实际观测符合得较好。

Using the data from 11 ground-based super neutron monitors, this paper deals with the effects of equatorial ring currents on cosmic rays, which include that of storm-time increases and cut off rigidities in the analysis of this paper, during periods of six geomagnetic storms of 1984-1989. It is shown that the storm-time increases are due to the existence of westward equatorial ring currents developing or intensifying during geomagnetic storms. The storm-time increases are of latitude and local time dependence and the intensifying ring currents can cause the depression of cosmic ray cutoff rigidities. By comparing the storm-time increases and the registrations of H-component recorded by Beijing Standard Seismic Station. It can be seen that they correlate negatively with each other. On the basis of two-dimensional symmetric model of ring current, it is also shown that, except some very large storms, the expected decreases of H-component originated from a ring current which are calculated with this model are in good agreement with the actual observations on the ground.