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Stepwise tailward retreat ofmagnetic reconnection: THEMIS observations of an auroral substorm
http://hdl.handle.net/2237/25179
http://hdl.handle.net/2237/2517965d6506f-ee5d-431c-904a-11942280acf8
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 | 2016-12-12 | |||||
タイトル | ||||||
タイトル | Stepwise tailward retreat ofmagnetic reconnection: THEMIS observations of an auroral substorm | |||||
言語 | en | |||||
著者 |
Ieda, A.
× Ieda, A.× Nishimura, Y.× Miyashita, Y.× Angelopoulos, V.× Runov, A.× Nagai, T.× Frey, H. U.× Fairfield, D. H.× Slavin, A.× Vanhamäki, H.× Uchino, H. |
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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 | © 2016 American Geophysical Union | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Auroral stepwise poleward expansions were clarified by investigating a multiple-onset substorm that occurred on 27 February 2009. Five successive auroral brightenings were identified in all-sky images, occurring at approximately 10 min intervals. The first brightening was a faint precursor. The second brightening had a wide longitude; thus, it represented the Akasofu substorm onset. Other brightenings expanded poleward; thus, they were interpreted to be auroral breakups. These breakups occurred stepwise; that is, later breakups were initiated at higher latitudes. Corresponding reconnection signatures were studied using Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellite observations between 8 and 24 RE down the magnetotail. The Akasofu substorm onset was not accompanied by a clear reconnection signature in the tail. In contrast, the three subsequent auroral breakups occurred simultaneously (within a few minutes) with three successive fast flows at 24 RE; thus, these were interpreted to be associated with impulsive reconnection episodes. These three fast flows consisted of a tailward flow and two subsequent earthward flows. The flow reversal at the second breakup indicated that a tailward retreat of the near-Earth reconnection site occurred during the substorm expansion phase. In addition, the earthward flow at the third breakup was consistent with the classic tailward retreat near the end of the expansion phase; therefore, the tailward retreat is likely to have occurred in a stepwise manner. We interpreted the stepwise characteristics of the tailward retreat and poleward expansion to be potentially associated by a stepwise magnetic flux pileup. | |||||
言語 | en | |||||
出版者 | ||||||
出版者 | Wiley | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | 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/10.1002/2015JA022244 | |||||
ISSN | ||||||
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 121, 号 5, p. 4548-4568, 発行日 2016-05-28 |
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値 | publisher | |||||
URI | ||||||
識別子 | http://doi.org/10.1002/2015JA022244 | |||||
識別子タイプ | DOI | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/25179 | |||||
識別子タイプ | HDL |