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Statistical Study of Phase Relationship Between Magnetic and Plasma Pressures in the Near‐Earth Nightside Magnetosphere Using the THEMIS‐E Satellite
http://hdl.handle.net/2237/00029437
http://hdl.handle.net/2237/000294378aca8843-de92-48da-8982-7aa5b62d2ff2
名前 / ファイル | ライセンス | アクション |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-03-07 | |||||
タイトル | ||||||
タイトル | Statistical Study of Phase Relationship Between Magnetic and Plasma Pressures in the Near‐Earth Nightside Magnetosphere Using the THEMIS‐E Satellite | |||||
言語 | en | |||||
著者 |
Nishi, Katsuki
× Nishi, Katsuki× Shiokawa, Kazuo× Glassmeier, Karl‐Heinz× Mieth, Johannes Z. D. |
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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 | © 2018 American Geophysical Union | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | plasma pressure | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | magnetic pressure | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | pressure balance | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | magnetosphere | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | plasma sheet | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | auroral fragmentation | |||||
抄録 | ||||||
内容記述 | Distributions of plasma and magnetic pressures are the basic information to investigate macroscopic dynamics of the Earth's magnetosphere. Several studies have been made on magnetic and plasma pressures and macroscopic plasma instabilities in the magnetosphere. However, correlation between magnetic and plasma pressure variations has not been statistically investigated. In this paper, we analyze the statistical characteristics of the phase relationships between variations of magnetic and plasma pressures at frequencies of 4–15 mHz using 2 years of the THEMIS‐E satellite data in the nightside magnetosphere. Spectral peaks with coherence greater than 0.85 between magnetic and plasma pressures for 1‐hr time segments were selected. The average occurrence rates of the phase relationships are antiphase (within ±10∘ from 180°), 39.75%; in‐phase (within ±10∘ from 0°), 0.73%; and other phases (10–170°), 49.83%. For the other‐phase events, the phase differences are much closer to antiphase rather than to in‐phase. Thus, we conclude that the two pressure variations tend to be antiphase. The antiphase and in‐phase relationships are observed mainly at radial distances outside 8 RE and inside 8 RE, respectively. The high occurrence region of antiphase relationship is in the dawnside during magnetically quiet times and shifts to dusk side at active times defined as Dst <−10 nT. The occurrence rates of the phase relationships do not change significantly depending on the AE and Dst indices, plasma β, and IMF‐Bz. Based on these results, we discuss the correspondence between the phase relationships and the possible magnetohydrodynamic force balances that can produce these phase relationships. | |||||
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:2019-05-01 | |||||
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/10.1029/2018JA025846 | |||||
ISSN(print) | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 2169-9380 | |||||
ISSN(Online) | ||||||
収録物識別子タイプ | EISSN | |||||
収録物識別子 | 2169-9402 | |||||
書誌情報 |
en : Journal of Geophysical Research: Space Physics 巻 123, 号 11, p. 9517-9531, 発行日 2018-11 |
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著者版フラグ | ||||||
値 | publisher |