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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Magnetic diffusivity ： ウィキペディア英語版 Magnetic diffusivity The magnetic diffusivity is a parameter in plasma physics. It appears in the Magnetic Reynolds number. The magnetic diffusivity is defined as:〔W. Baumjohann and R. A. Treumann, ''Basic Space Plasma Physics'', Imperial College Press, 1997〕 :$\backslash eta\; =\; \backslash frac$. * $\backslash mu\_0$ is the permeability of free space. * $\backslash sigma\_0$ is the electrical conductivity of the material in question. In case of a plasma, this is the conductivity due to Coulomb or neutral collisions: $\backslash sigma\_0=\backslash frac$, where * * $n\_e$ is the electron density. * * $e$ is the electron charge. * * $m\_e$ is the electron mass. * * $\backslash nu\_c$ is the collision frequency. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Magnetic diffusivity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.