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Structure of large amplitude abrupt magnetic variations observed by the MAGSAT
https://nipr.repo.nii.ac.jp/records/2159
https://nipr.repo.nii.ac.jp/records/215983b60787-4b92-4a4f-b8ef-7de72080d76c
名前 / ファイル | ライセンス | アクション |
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KJ00000012712 (1.0 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1987-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Structure of large amplitude abrupt magnetic variations observed by the MAGSAT | |||||
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 | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Iyemori, Toshihiko
× Iyemori, Toshihiko× Nakagawa, Akinari× Ikeda, Tatsuya |
|||||
著者所属(英) | ||||||
en | ||||||
Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University | ||||||
著者所属(英) | ||||||
en | ||||||
Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University | ||||||
著者所属(英) | ||||||
en | ||||||
Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The structure and occurrence characteristics of large amplitude abrupt magnetic variations that are frequently observed over the auroral oval are statistically analyzed using the high time resolution data obtained by the MAGSAT. A superposed epoch analysis shows a systematic difference in the structure between the upward and downward field-aligned currents, confirming that the abrupt variations are due to spatial structure of small-scale field-aligned current sheets. The estimated current density is very high (>90μA/m^2). The high density downward currents are canceled by adjacent strong upward currents, and the net current is upward or almost zero. On the other hand, a high density upward current does not necessarily accompany adjacent strong downward current, and the net current around the region is upward. The thickness of the current sheet is normally 0.5-1.0km or less, suggesting that the events are related to the rayed auroral arc elements. The occurrence frequency decreases rapidly as the amplitude of abrupt jump increases, and the dependence is describable by a simple power function, suggesting that the abrupt jumps are the events that distribute in the high density side trail of the small-scale field-aligned current density distribution. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 47, p. 130-138, 発行日 1987-03 |