Title

Steady and unsteady Hall magnetohydrodynamics near an X-type magnetic neutral line

Authors

Authors

B. K. Shivamoggi

Comments

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Abbreviated Journal Title

Phys. Plasmas

Keywords

CURRENT-SHEET FORMATION; COLLISIONLESS RECONNECTION; EARTHS MAGNETOTAIL; LARGE SYSTEMS; TEARING MODE; FLUID; FIELD; DISSIPATION; PLASMA; INSTABILITY; Physics, Fluids & Plasmas

Abstract

Hall magnetohydrodynamics (MHD) properties near a two-dimensional (2D) X-type magnetic neutral line in the steady state are considered via heuristic and rigorous developments. The heuristic development turns out to be useful in providing insight into the lack of dependence of the reconnection rate on the mechanism breaking the frozen-in condition of the magnetic field lines in the electron fluid. The latter result can be understood in terms of the ability of the ions and electrons to transport equal amounts of magnetic flux per unit time out of the reconnection region. The Hall effects are shown via a rigorous development to be able to sustain the hyperbolicity of the magnetic field (and hence a more open X-point configuration) near the neutral line in the steady state. The time-dependent Hall MHD problem shows that the Hall effect, when sufficiently strong, can indeed quench the finite-time singularity exhibited in ideal MHD. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3581092]

Journal Title

Physics of Plasmas

Volume

18

Issue/Number

5

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

8

WOS Identifier

WOS:000292209500025

ISSN

1070-664X

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