THEMIS observations of compressional Pc5 pulsations in the dawn- and duskside magnetosphere

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2024-09-19 DOI:10.1016/j.asr.2024.09.028

G.I. Korotova , D.G. Sibeck

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引用次数: 0

Abstract

We present case and statistical studies of compressional Pc5 pulsations observed by the THEMIS spacecraft in the dawn- and duskside magnetosphere from 2007 to 2011. A case study provides evidence for compressional Pc5 pulsations in the dawnside magnetosphere following the arrival of particles injected by a substorm and the subsequent growth of the drift mirror instability on February 27, 2011. The statistical study shows that the Pc5 pulsations occur in a weak or moderately disturbed magnetosphere but rarely develop during strong magnetic activity (i. e., for Dst index below −25 nT). The most striking characteristic of the compressional Pc5 pulsations is their localization in latitude and longitude over many consecutive days. Dawnside Pc5 pulsations occur under quieter conditions, last longer, and attain greater amplitudes than duskside Pc5 pulsations. We attribute compressional pulsations in both sectors to the drift mirror instability, with a warmer, more energized, and gradient-curvature drifting population of substorm-injected ions on the duskside and a colder ExB drifting population of plasma sheet ions on the dawnside.

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THEMIS 对黎明和黄昏磁层中压缩性 Pc5 脉动的观测

我们介绍了 THEMIS 航天器从 2007 年到 2011 年在黎明和黄昏磁层观测到的压缩 Pc5 脉动的案例和统计研究。案例研究提供了证据，证明在 2011 年 2 月 27 日亚暴注入的粒子到达黎明侧磁层以及随后的漂移镜不稳定性增长之后，黎明侧磁层出现了压缩性 Pc5 脉动。统计研究表明，Pc5 脉动发生在弱或中度扰动的磁层中，但很少在强磁活动期间（即 Dst 指数低于 -25 nT 时）出现。压缩 Pc5 脉动最显著的特征是连续多日的经纬度定位。与黄昏时的 Pc5 脉动相比，黎明时的 Pc5 脉动发生在更安静的条件下，持续时间更长，振幅更大。我们将这两个扇区的压缩脉动归因于漂移镜不稳定性，在黄昏侧，亚暴注入离子群的温度较高、能量较强、具有梯度曲率漂移，而在黎明侧，等离子体片离子群的ExB漂移温度较低。

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

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.