Observation of the terrestrial bow shock in quasi‐electrostatic subshock regime
Observation of the terrestrial bow shock in quasi‐electrostatic subshock regime
复制标题
准静电亚震状态下的地面弓形激波观测
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
K. Yearby
中科院分区：
文献类型：
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作者：
M. Balikhin;M. Nozdrachev;M. Dunlop;V. Krasnoselskikh;S. Walker;H. Alleyne;V. Formisano;M. André;A. Balogh;A. Eriksson;K. Yearby
[1]在四颗第二类卫星上进行的电场测量被用来估计准垂直状态下地面弓形激波前部静电势的空间尺度。在2001年3月31日的冲击波阵面上测量到了高振幅电场（高达70 mV m−1）。交叉冲击电位的主要变化发生在几个电子惯性长度的空间尺度上。静电势的这种小尺度可以用准静电次冲击概念的框架来解释。上游磁场的强度很高，导致了异常小的β和中等马赫数，为激波阵面中准静电次激波的发生创造了有利条件。
[1] Electric field measurements made on board the four Cluster II satellites are used to estimate the spatial scale of the electrostatic potential in the front of the terrestrial bow shock in the quasi-perpendicular regime. High-amplitude electric fields (up to 70 mV m−1) were measured at the shock fronts encountered on 31 March 2001. The main change in the cross-shock potential took place on spatial scales of a few electron inertial lengths. Such small scales in the electrostatic potential can be explained in the framework of the quasi-electrostatic subshock concept. The high magnitude of the upstream magnetic field, which resulted in an unusually small β and moderate Mach numbers, created favorable conditions for the occurrence of quasi-electrostatic subshocks in the shock front.