摘要
本文运用摄动法解析地研究了磁尾电流片平板模型非线性撕裂模的时间演化及与晨昏电场的相互作用.结果表明,撕裂模的非线性时间演化最终会形成磁岛,磁岛宽度与扰动增长率的四次方根成正比;在扰动晨昏电场的作用下,磁岛宽度可发生尖点突变,尖点突变临界值所对应的晨昏电场扰动幅值约为5mV/m,这与磁亚暴发生时晨昏电场的幅值对应.
In this paper, we have studied the nonlinear properties of the time evolution of tearing modes in the electric current sheet at the magnetotail and the interactions with the dawn dush electric field by the perturbation methods. The results are follows: 1. the nonlinear time evolution of the tearing modes can develop magneto-islands finally,2. the widths of islands are relative to the fourth square root of growth rate, and 3. the widths of islands can happen cusp catastrophes in the actions of dawn-dush electric field.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期133-140,共8页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
磁尾
电流片
撕裂模
非线性性态
Magnetotail,Electric current sheet, Tearing modes, Nonlinear properties
