Phase mixing of a three dimensional magnetohydrodynamic pulse

Details Phase mixing of a three dimensional magnetohydrodynamic pulse Phase mixing of a three dimensional magnetohydrodynamic pulse

2002-10-04

arxiv.org/abs/astro-ph/0210117v2

Astron.Astrophys. 400 (2003) 1051-1055

Astronomy and Astrophysics

Astrophysics

final accepted version Astron. Astrophys

Scientific paper

10.1051/0004-6361:20030062

Phase mixing of a three dimensional magnetohydrodynamic (MHD) pulse is studied in the compressive, three-dimensional (without an ignorable coordinate) regime. It is shown that the efficiency of decay of an Alfvenic part of a compressible MHD pulse is related linearly to the degree of non-planeness of the pulse in the homogeneous transverse direction. In the developed stage of phase mixing (for large times), coupling to its compressive part does not alter the power-law decay of an Alfvenic part of a compressible MHD pulse. The same applies to the dependence upon the resistivity of the Alfvenic part of the pulse. All this implies that the dynamics of Alfven waves can still be qualitatively understood in terms of the previous 2.5D models. Thus, the phase mixing remains a relevant paradigm for the coronal heating applications in the realistic 3D geometry and compressive plasma.

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