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Distortion of the nightside boundary of the "firmly-closed" region in the 1996 Tsyganenko magnetic field model
https://iwate-u.repo.nii.ac.jp/records/12583
https://iwate-u.repo.nii.ac.jp/records/125831c1499af-4a6b-4297-a679-345aa93cdfb0
名前 / ファイル | ライセンス | アクション |
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apuar-v15p43-60.pdf (663.7 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2010-01-04 | |||||
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 | |||||
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 | |||||
著者 |
Yamamoto, Takashi
× Yamamoto, Takashi× Inoue, Shoshi× Ozaki, Masao |
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著者(機関) | ||||||
Department of Earth and Planetary Physics, University of Tokyo | ||||||
著者(機関) | ||||||
Faculty of Education, Iwate University | ||||||
著者(機関) | ||||||
Institute of Industrial Science, (Present Address)Tokyo University of Agriculture University of Tokyo | ||||||
登録日 | ||||||
日付 | 2010-01-04 | |||||
書誌情報 |
Advances in polar upper atmosphere research 巻 15, p. 43-60, 発行日 2001-01-01 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1345-1065 | |||||
Abstract | ||||||
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. | |||||
出版者 | ||||||
出版者 | National Institute of Polar Research | |||||
権利 | ||||||
権利情報 | (c) 2001 National Institute of Polar Research | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |