地磁扰动期間史篤默捕获区的变化

本文利用了史篤默（Stormer）的理論来討論在地磁扰动期間史篤默捕获区的变化。在計算过程中我們只是考虑到单一粒子在捕获区內的运动。地磁扰动我們分別取以下两种形式:（1）当扰动磁場是均勻的而且其方向与磁軸相反;（2）当扰动磁場是由位于赤道面上5至8个地球半径的电流环引起的。計算結果认为在磁扰期間捕获区将要发生变化。这个变化引起了捕获区內粒子数目的变化。最后我們将根据上述的結果討論美国人造卫星（探险者Ⅵ号）所观測到磁暴期間外輻射带的变化。

THE VARIATION OF THE STORMERS TRAPPED REGION DURING THE MAGNETIC DISTURBANCE

In this paper the variation of the Strmér's trapped region during magnetic distubance is investigated with method dealing only with the motion of a single charged particle. Two types of assumed disturbances are considered: （1） the perturbed field is almost uniform in the direction antiparallel with the dipole's axis, （2） the perturbed field is originated from a ring current situated between 5 to 8 earth radii on the equatorial plane. It is shown that the trapped region will be greatly disturbed during the magnetic storm, and the particle number will vary accordingly. These results are discussed in connection with the variation of the outer radiation belt during the geomagnetic storm observed by Explorer Ⅵ.