| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2010-01-04 |
| タイトル |
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|
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 |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Yamamoto, Takashi
Inoue, Shoshi
Ozaki, Masao
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| 著者(機関) |
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|
値 |
Department of Earth and Planetary Physics, University of Tokyo |
| 著者(機関) |
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|
値 |
Faculty of Education, Iwate University |
| 著者(機関) |
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|
値 |
Institute of Industrial Science, (Present Address)Tokyo University of Agriculture University of Tokyo |
| 登録日 |
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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
|
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1345-1065 |
| Abstract |
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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 |
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出版者 |
National Institute of Polar Research |
| 権利 |
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|
権利情報 |
(c) 2001 National Institute of Polar Research |
| 著者版フラグ |
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出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
apuar-v15p43-60.pdf (663.7 kB)
