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On non-Markovian relative diffusion of stochastic magnetic lines

Gy Steinbrecher, M Negrea, N Pometescu, J H Misguich1997年Plasma Physics and Controlled FusionIF 2.2出版社

In this paper we study some aspects related to the spatial relative diffusion of the magnetic-field lines. The nonlinear integral equation for the Lagrangian correlation is transformed into a system of two ordinary differential equations and solved numerically. The system of linear integro-differential equations for the moments is analysed numerically for different values of the -parameter (which is proportional to the ratio of parallel and perpendicular correlation lengths). A critical value for is obtained in a shearless stochastic magnetic-field model. For the rate of damping of the anisotropy becomes complex, that means an oscillatory behaviour for the correlations and anisotropies. For we find the well known behaviour described in the literature for .

日本語訳

本論文では、磁力線の空間的相対拡散に関連するいくつかの側面を研究する。ラグランジアン相関に関する非線形積分方程式は、二つの常微分方程式系に変換され、数値的に解かれる。モーメントに関する線形積分微分方程式系は、-パラメータ(平行および垂直方向の相関長の比に比例する)の異なる値に対して数値的に解析される。せん断のない確率的磁場モデルにおいて、 の臨界値が得られる。 の場合、異方性の減衰率は複素数となり、これは相関および異方性に対する振動的挙動を意味する。 の場合、文献において に対して記述されているよく知られた挙動が見出される。

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