Coulomb lifetime of the ring current ions with time varying plasmasphere
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- Ebihara Yusuke
- Department of Polar Science, The Graduate University for Advanced Studies
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- Ejiri Masaki
- National Institute of Polar Research
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- Miyaoka Hiroshi
- National Institute of Polar Research
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We have developed a time-dependent model of the plasmasphere to evaluate the spatial variation of the Coulomb lifetime of ring current ions. Coulomb collision has been considered to be one of major loss processes of the ring current ions interacted with the thermal plasma in the plasmasphere. The distribution of plasmaspheric density is derived by a continuity equation under the hydrostatic assumption. The protons supplied from both conjugate ionospheres are drifted by a time-dependent convection field and a corotation electric field. Calculated profiles of the number density and the relative motion of the plasmasphere are in fairly good agreement with the observational results by EXOS-B satellite. We traced the energetic ions during a storm on June 4-8, 1991 and calculated the differential flux and the pressure to examine the loss effects on the pressure due to the both loss processes. We found that (1) the Coulomb collision loss restrictively affects at L ≤ 3 because the plasmasphere drastically shrank due to the strong convection, and that (2) there is no significant change in the ion composition ratio during the initial rapid recovery of Dst, i. e., the rapid recovery of Dst is not caused by the short charge exchange lifetime of O+ ions for this particular storm.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 50 (4), 371-382, 1998
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206510457472
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- NII論文ID
- 10002206504
- 130003955901
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- NII書誌ID
- AA11211921
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- COI
- 1:CAS:528:DyaK1cXksVyntrs%3D
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- ISSN
- 18805981
- 13438832
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 使用不可