The coalescence instability and the development of current sheets in two‐dimensional magnetohydrodynamics
作者:
D. W. Longcope,
H. R. Strauss,
期刊:
Physics of Fluids B: Plasma Physics
(AIP Available online 1993)
卷期:
Volume 5,
issue 8
页码: 2858-2869
ISSN:0899-8221
年代: 1993
DOI:10.1063/1.860673
出版商: AIP
数据来源: AIP
摘要:
A class of two‐dimensional force‐free equilibria are shown to be subject to an ideal linear instability. This instability is similar to the coalescence instability for chains of magnetic islands. Semianalytic methods are used to find second magnetic equilibrium which is accessible from the first and has lower magnetic energy. This equilibrium has a discontinuous magnetic field and current sheets at these discontinuities. Numerical simulations indicate that the nonlinear evolution of the instability allows the plasma to relax to this discontinuous equilibrium.
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