Width of plasmaspheric plumes related to the level of geomagnetic storm intensity

IF 1.7 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Annales Geophysicae Pub Date : 2022-12-05 DOI:10.5194/angeo-40-673-2022

Zhanrong Yang, Haimeng Li, Z. Yuan, Zhihai Ouyang, X. Deng

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引用次数: 0

Abstract

Abstract. The plume is a plasma region in the magnetosphere that is detached from the main plasmasphere. It significantly contributes to the dynamic processes in both the inner and outer magnetosphere. In this paper, using Van Allen Probe A (VAP-A), the correlation between plume width and the level of geomagnetic storm intensity is studied. First, through the statistical analysis of all potential plume events, we find that there is almost no correlation between plume width and the level of geomagnetic storm intensity. However, for the plumes in the recovery phase after improved sifting, it seems that there is a negative correlation between the plume width and the absolute value of minimum Dst during a storm. Utilizing test particle simulations, we study the dynamic evolution patterns of plumes during two geomagnetic storms. The simulated structures of the two plasmaspheric plumes are roughly consistent with the structures observed by the Van Allen Probe A. This result suggests that the plasmaspheric particles escape quickly during intense geomagnetic storms, causing the width of the plume to be relatively narrow during the recovery phase of intense geomagnetic storms. These results are helpful for understanding the dynamic evolution of the plasmasphere and plume during geomagnetic storms.

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等离子体羽流宽度与地磁风暴强度的关系

摘要羽流是磁层中与主等离子层分离的等离子体区域。它对内外磁层的动力学过程都有重要的贡献。本文利用Van Allen探针A (VAP-A)对羽流宽度与地磁风暴强度的相关性进行了研究。首先，通过对所有潜在羽流事件的统计分析，我们发现羽流宽度与地磁风暴强度之间几乎没有相关性。然而，对于改进筛选后恢复阶段的羽流，羽流宽度与风暴期间最小Dst绝对值之间似乎存在负相关关系。利用试验粒子模拟，研究了两次地磁风暴期间羽流的动态演化模式。这两个等离子体羽流的模拟结构与Van Allen探测器a观测到的结构基本一致。这表明，在强地磁风暴期间，等离子体粒子快速逃逸，导致在强地磁风暴恢复阶段，等离子体羽流的宽度相对较窄。这些结果有助于理解磁暴过程中等离子层和羽流的动态演化。

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

Annales Geophysicae 地学-地球科学综合

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Annales Geophysicae (ANGEO) is a not-for-profit international multi- and inter-disciplinary scientific open-access journal in the field of solar–terrestrial and planetary sciences. ANGEO publishes original articles and short communications (letters) on research of the Sun–Earth system, including the science of space weather, solar–terrestrial plasma physics, the Earth''s ionosphere and atmosphere, the magnetosphere, and the study of planets and planetary systems, the interaction between the different spheres of a planet, and the interaction across the planetary system. Topics range from space weathering, planetary magnetic field, and planetary interior and surface dynamics to the formation and evolution of planetary systems.