The Comprehensive Response of the Magnetopause to the Impact of an Isolated Magnetosheath High-Speed Jet

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2024-11-07 DOI:10.1029/2024GL111132

Jiuqi Ma, Binbin Tang, Xinliang Gao, Wenya Li, Quanming Lu, Wenlong Guo, Jin Guo, Huijie Liu, Chi Wang

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Abstract

The magnetopause is the boundary between the Earth's magnetosphere and the solar wind. Magnetosheath high-speed jets can impact the magnetopause, causing local indentation and subsequently rebound. However, the comprehensive response of the magnetopause to the impact of a high-speed jet remains unclear. In this study, we establish that the full spatiotemporal response pattern of the magnetopause to the impact of an isolated magnetosheath high-speed jet can be characterized as an “Indentation-Rebounce-Relaxation” sequence from a statistical view. Based on the pressure balance, we estimate the spatial and temporal scales of the entire response process to range from 0.5 to 3.2 Earth radii and 0.9–4.7 min, respectively. Furthermore, we find that the interaction between the magnetopause and the high-speed jet during the rebounce phase distorts the magnetopause, subsequently generating pairs of field-aligned currents. These generated field-aligned currents may flow to the ionosphere, potentially contributing to magnetosphere-ionosphere coupling.

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磁层顶对孤立磁鞘高速喷流冲击的综合响应

磁层顶是地球磁层和太阳风之间的边界。磁层高速喷流会撞击磁层顶，造成局部压痕，随后反弹。然而，磁层顶对高速射流撞击的综合反应仍不清楚。在这项研究中，我们确定了磁层顶对孤立磁鞘高速射流撞击的全面时空响应模式，从统计学角度看，可以将其表征为 "压痕-反弹-松弛 "序列。根据压力平衡，我们估计整个响应过程的空间和时间尺度分别为 0.5 至 3.2 个地球半径和 0.9 至 4.7 分钟。此外，我们还发现，在反弹阶段，磁层顶和高速喷流之间的相互作用会扭曲磁层顶，随后产生成对的场对准电流。这些产生的场对准电流可能会流向电离层，从而有可能促成磁层-电离层耦合。

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

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.