Self-Organization and Heating by Inward Diffusion in Magnetospheric Plasmas
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- SATO Naoki
- Graduate School of Frontier Sciences, The University of Tokyo
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- YOSHIDA Zensho
- Graduate School of Frontier Sciences, The University of Tokyo
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- KAWAZURA Yohei
- Graduate School of Frontier Sciences, The University of Tokyo
説明
<p>Through the process of inward diffusion, a strongly localized clump of plasma is created in a magnetosphere. The creation of the density gradient, instead of the usual flattening by a diffusion process, can be explained by the topological constraints given by the adiabatic invariants of magnetized particles [ Z. Yoshida and S.M. Mahajan, Prog. Theor. Exp. Phys. 2014, 073J01 (2014). N. Sato and Z. Yoshida, J. Phys. A: Math. Theor. 48, 205501 (2015).]. After developing a canonical formalism for the standard guiding center dynamics in a dipole magnetic field, we complete our attempt to build a statistical mechanics on a constrained phase space by discussing the construction principles of the associated diffusion operator. We then investigate the heating mechanism associated with inward diffusion: as particles move toward regions of higher magnetic field, they experience preferential heating of the perpendicular (with respect to the magnetic field) temperature in order to preserve the magnetic moment. A relationship between conservation of bounce action and temperature isotropy emerged. We further show that this behavior is scaled by the diffusion parameter of the Fokker-Planck equation. These results are confirmed by numerical simulations.</p>
収録刊行物
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- Plasma and Fusion Research
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Plasma and Fusion Research 11 (0), 2401009-2401009, 2016
一般社団法人 プラズマ・核融合学会
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詳細情報 詳細情報について
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- CRID
- 1390282680231575040
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- NII論文ID
- 130005330462
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- ISSN
- 18806821
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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
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可