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Severe Magnetic Fluctuations in the Near‐Earth Magnetotail: Spectral Analysis and Dependence on Solar Activity
http://hdl.handle.net/2237/00033207
http://hdl.handle.net/2237/000332072d8271bb-16b0-44fd-9154-b8fe37cda463
名前 / ファイル | ライセンス | アクション |
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2020JA027834 (7.6 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2020-12-16 | |||||
タイトル | ||||||
タイトル | Severe Magnetic Fluctuations in the Near‐Earth Magnetotail: Spectral Analysis and Dependence on Solar Activity | |||||
言語 | en | |||||
著者 |
Xu, Heqiucen
× Xu, Heqiucen× Shiokawa, Kazuo |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | © 2020 American Geophysical Union | |||||
抄録 | ||||||
内容記述 | Magnetic fluctuations in the near‐Earth magnetotail are an important signature of substorm onset. In a previous statistical study, we reported their occurrence rates, spatial distributions, and relationship with plasma flows. In the present study, we investigated their spectral properties using 11 years of measurements from the Time History of Events and Macroscale Interactions during Substorms mission for 2008–2018. We found 10,848 severe magnetic fluctuation events with σB∕ ̄B > 0.5, where σB and ̄B are the standard deviation and average, respectively, of the magnetic field intensity for the local proton gyroperiod. The occurrence rates of severe magnetic fluctuations show no clear dependence on the F10.7 index in one solar cycle. We extracted 36 dipolarization events with severe magnetic fluctuations. In the power spectral density (PSD) of the magnetic fluctuations during dipolarizations, the steepness of the spectral slope increased with increasing frequency in almost all the events. The average PSDs are shown sorted by (a) distance to the neutral sheet and (b) ambient magnetic field intensity. In all groups, the slopes of the average PSDs increased abruptly from below ∼10^−1.3 Hz (0.05 Hz) to above ∼10^−1.3 Hz, which is close to the gyrofrequency of O^+ ions. It is the first time that a change of slope near the proton gyrofrequency (frequency range: 0.05–1 Hz) was found in cases of larger ambient magnetic field intensity, implying that the magnetic fluctuations were relatively strong near the proton gyrofrequency. These results suggest that the magnetic fluctuations contribute to the nonmagnetohydrodynamic effect in the ion motion. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | ファイル公開:2021-01-01 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | Wiley | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1029/2020JA027834 | |||||
ISSN(print) | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 2169-9380 | |||||
書誌情報 |
en : Journal of Geophysical Research: Space Physics 巻 125, 号 7, p. e2020JA027834, 発行日 2020-07 |
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著者版フラグ | ||||||
値 | publisher |