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arXiv 0708.4247math-phmath.MP
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三维静态等离子体平衡系统的对称性、守恒律和精确解

Symmetries, conservation laws and exact solutions of static plasma equilibrium systems in three dimensions

Alexei F. Cheviakov, Stephen C. Anco

摘要:

对于各向同性和各向异性磁流体力学等离子体平衡模型的静态约化,提出了一个完整的分类,承认点对称性和守恒律到一阶。结果表明,各向同性方程的对称代数是有限维的,而各向异性方程则允许无限对称性,具体取决于定义在磁表面集合上的自由函数。建立了各向同性方程与各向异性方程之间的一种直接变换,为构造新的各向异性精确解提供了一种有效的方法。特别是,轴向和螺旋对称的各向异性等离子体平衡来自经典的格拉德-沙夫拉诺夫和JFKO方程。

英文摘要:

For static reductions of isotropic and anisotropic Magnetohydrodynamics plasma equilibrium models, a complete classification of admitted point symmetries and conservation laws up to first order is presented. It is shown that the symmetry algebra for the isotropic equations is finite-dimensional, whereas anisotropic equations admit infinite symmetries depending on a free function defined on the set of magnetic surfaces. A direct transformation is established between isotropic and anisotropic equations, which provides an efficient way of constructing new exact anisotropic solutions. In particular, axially and helically symmetric anisotropic plasma equilibria arise from classical Grad-Shafranov and JFKO equations.

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