Phase mixing of Alfven waves in 2D configurations

Details Phase mixing of Alfven waves in 2D configurations Phase mixing of Alfven waves in 2D configurations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0479f&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0479

Physics

7827 Kinetic And Mhd Theory, 7871 Waves And Instabilities, 2744 Magnetotail, 2752 Mhd Waves And Instabilities

Scientific paper

The phase mixing of shear Alfven waves in various non homogeneous 2D geometries is analysed. An inhomogeneous bounded system may be considered as a collection of oscillators coupled by friction. Each field line oscillates at its own frequency and becomes more and more out of phase with its neighbours. The phase mixing creates large transverse gradients which strongly enhances the energy dissipation. Here, we solve an initial value problem (1) in a X-point configuration and (2) in a Harris sheet with a small transverse magnetic field. Both viscous and resistive terms are taken into account. We compute the rate of dissipation of the initial energy and we discuss the influence of the ratio eta/nu on this rate.

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