MAGNETIC RELAXATION, CURRENT SHEETS, AND STRUCTURE FORMATION IN AN EXTREMELY TENUOUS FLUID MEDIUM

MAGNETIC RELAXATION, CURRENT SHEETS, AND STRUCTURE FORMATION IN AN EXTREMELY TENUOUS FLUID MEDIUM
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极其稀薄的流体介质中的磁弛豫、电流片和结构形成

DOI:
10.1088/0004-637x/779/2/169
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发表时间:
2013
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Bajer K
Bajer K
中科院分区:
--
文献类型:
--
作者:
Bajer K

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研究了高导电性稀薄流体介质中单向磁场的弛豫过程。在这一过程中,实地的监测点发挥着关键作用。在弛豫的初始阶段,磁压的变化被消除,电流片在零点附近建立。这个初始阶段之后是一个漫长的扩散阶段的缓慢代数衰减的领域,在此期间,流体被不断吸入电流片,导致指数增长的流体密度和浓度的质量周围的零点,这表明集群的趋势。最终,代数衰减的第二阶段让位于场的指数衰减的最后阶段。零点处的密度峰值作为衰变过程的化石遗迹而存在。控制方程的数值解提供了令人信服的确认这三个阶段的情况。概括到二维和三维领域的简要考虑。
The process of relaxation of a unidirectional magnetic field in a highly conducting tenuous fluid medium is considered. Null points of the field play a critical role in this process. During an initial stage of relaxation, variations in magnetic pressure are eliminated, and current sheets build up in the immediate neighborhood of null points. This initial phase is followed by a long diffusive phase of slow algebraic decay of the field, during which fluid is continuously sucked into the current sheets, leading to exponential growth of fluid density and concentration of mass around the null points, which show a tendency to cluster. Ultimately, this second phase of algebraic decay gives way to a final period of exponential decay of the field. The peaks of density at the null points survive as a fossil relic of the decay process. Numerical solution of the governing equations provides convincing confirmation of this three-stage scenario. Generalizations to two-and three-dimensional fields are briefly considered.
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