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Distortion of the nightside boundary of the "firmly-closed" region in the 1996 Tsyganenko magnetic field model
https://doi.org/10.15094/00006330
https://doi.org/10.15094/000063301498d4b0-f617-4f9a-a0db-69770a8cb478
名前 / ファイル | ライセンス | アクション |
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KJ00000048070 (2.1 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2001-09-01 | |||||
タイトル | ||||||
タイトル | Distortion of the nightside boundary of the "firmly-closed" region in the 1996 Tsyganenko magnetic field model | |||||
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 | |||||
ID登録 | ||||||
ID登録 | 10.15094/00006330 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Yamamoto,Takashi
× Yamamoto,Takashi× Inoue, Shoshi× Ozaki, Masao |
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著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Physics, University of Tokyo/Faculty of Education, Iwate University/Institute of Industrial Science, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | This paper proposes that the outer boundary of the "firmly-closed" region should be represented by field lines with the adiabaticity parameter, K, equal to unity at the equator, where K^2 is the ratio between the radius of the field-line curvature and the Larmor radius of an ion with 1 keV of energy. Just outside the boundary where K = 1, plasma particles (primarily ions) can be nonadiabatically accelerated in the presence of the dawn-to-dusk electric field. An inwardly convecting flux tube will attain the maximum content of nonadiabatically accelerated particles when it passes the K - 1 boundary. Thus, the K = 1 boundary outlines the region of the plasma population with a maximum content of nonadiabatically accelerated particles. In addition, the field lines with K = 1 are shown to have a minimum field strength of roughly 1 nT at the equator. From this fact, a field line with k < 1 may not be considered as being "firmly-closed" in the sense that such a field line may easily merge with an interplanetary field line. The outer boundary of the nightside firmly-closed region in the Tsyganenko model has an IMF Bz dependence that is consistent with observations. Moreover, this boundary is found to be "distorted", favoring the generation of region 1 field-aligned currents. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11397422 | |||||
書誌情報 |
Advances in polar upper atmosphere research 巻 15, p. 43-60, 発行日 2001-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |