Filamentation Instability of Nonlinear Alfven Waves in Weakly Ionized Plasmas

Details Filamentation Instability of Nonlinear Alfven Waves in Weakly Ionized Plasmas Filamentation Instability of Nonlinear Alfven Waves in Weakly Ionized Plasmas

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487..921s&link_type=abstract

Astrophysical Journal v.487, p.921

Astronomy and Astrophysics

Astronomy

13

Magnetohydrodynamics: Mhd, Plasmas, Waves

Scientific paper

We investigate an instability that leads to the filamentation of large-amplitude Alfven waves propagating along a homogeneous magnetic field in weakly ionized plasmas by using a neutral MHD simulation code. The dispersion relation of small-amplitude Alfven waves is confirmed by a one-dimensional simulation code. The linear instability leading to the filamentation is investigated by imposing small density perturbations across a magnetic field. We demonstrate the results of the nonlinear stage of the above filamentation instability with a two-dimensional simulation showing the occurrence of localized plasma heating during repeated coalescence and fission of the filaments. We discuss the implication of these results for plasma-heating processes observed in the photosphere of the Sun.

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