太阳风中磁重联的可能性及其观测证据

THE PROBABILITY OF THE MAGNETIC FIELD RECONNECTION IN THE SOLAR WIND AND ITS OBSERVRTIONAL EVIDENCE

本文利用美国行星际监测卫星IMP-H和IMP-J同时在弓激波上游的极佳时机(1976年1月21日—22日)探测的结果,比较了两个卫星同时测得的离子脉冲(E≥125 keV/Q,Q≥1)的计数率和各向异性.分析表明在IMP-H比IMP-J离地球远的四个事件a—d中,a和b事件时,IMP-H上测得的计数率大于IMP-J上计数率,各向异性从太阳指向地球;c事件时,IMP-J上计数率大于IMP-H上的测量值,各向异性从太阳指向地球;d事件时,IMP-J上计数率大于IMP-H上的相应值,各向异性改变方向,从地球指向太阳.它们可以用太阳风中扇形边界样的磁场反转形态磁重联产生的高能粒子的假说来满意地得到解释.

By comparing the intensity and anisotropy of the ion bursts (E≥125 keV/Q, Q≥1) observed simultaneously by IMP-H and IMP-J satellites upstream of the bow shock in the time of January 21-22, 1976, it is shown that for four bursts a-d when IMP-H is farther from the earth than IMP-J, (1) in the a and b bursts, the intensity observed by IMP-H is larger than that by IMP-J, and the anisotropy measurement made by IMP-J is flowing in a direction from the sun to the earth; (2) in the burst c, there is the same direction as the a and b bursts in the anisotropy, but the intensity observed by IMP-H is smaller than that by IMP-J; (3) in the burst d, the characteristics of the intensity and anisotropy is both opposite to that in the a and b bursts. The phenomena can be interpreted satisfactorily by supposing that there are magnetic field re-connections in the solar wind which could produce energetic particles in the medium.