Study of Double-Pulse Magnetic Structure During Decoupling Expansion of Debris Plasma

IF 2.9 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Ziming Wang, Ye Dong, Mengmeng Song, Zhaohui Liu, Wei Yang, Qiang Sun, Wenbin Wu, Zhekai Luo, Hantian Zhang, Qianhong Zhou
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Abstract

The decoupling expansion of debris plasma refers to the process where debris plasma generated by a high-altitude nuclear explosion (HANE) slips through the ambient plasma. Unlike the coupled expansion of the debris plasma and ambient plasma, decoupling expansion leads to a smaller magnetic cavity and wider debris dispersal. This significantly alters the magnetic field structures within hundreds of kilometers around the HANE center and even the artificial radiation belt at higher altitude. In this paper, the evolution mechanism of the double-pulse magnetic structure is investigated by simulating the decoupling expansion process of super- Alfvénic debris plasma using a two-dimensional hybrid model. It is found that the rapidly formed azimuthal electron current generates a debris magnetic pulse (the initial magnetic pulse), which remains attached to the expanding debris shell. Subsequently, the spatially nonmonotonically varying ambient ions velocity, characterized by an initial increase followed by a decrease, aggregates ambient ions to gradually form an ambient magnetic pulse (the second magnetic pulse). This study provides essential insights into the magnetic field evolution during the decoupling expansion and the interaction between debris and ambient plasma.

碎片等离子体解耦膨胀过程中的双脉冲磁结构研究
碎片等离子体的解耦膨胀是指高空核爆炸(HANE)产生的碎片等离子体穿过周围等离子体的过程。与碎片等离子体和周围等离子体的耦合膨胀不同,解耦膨胀导致更小的磁腔和更宽的碎片分散。这大大改变了HANE中心周围数百公里范围内的磁场结构,甚至在更高海拔的人工辐射带。本文采用二维混合模型模拟了超alfv碎屑等离子体的解耦膨胀过程,研究了双脉冲磁结构的演化机理。发现快速形成的方位电流产生一个碎片磁脉冲(初始磁脉冲),该脉冲仍然附着在膨胀的碎片壳上。随后,空间非单调变化的环境离子速度呈现先增后降的特征,聚集环境离子,逐渐形成环境磁脉冲(第二次磁脉冲)。这项研究为解耦膨胀过程中的磁场演变以及碎片与周围等离子体的相互作用提供了重要的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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