Phase mixing of Alfvén waves in an open and stratified atmosphere

Details Phase mixing of Alfvén waves in an open and stratified atmosphere Phase mixing of Alfvén waves in an open and stratified atmosphere

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..537..224d&link_type=abstract

WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS. AIP Conference Proceedings, Volume 537, pp. 224-232 (2000).

Physics

Magnetohydrodynamic Waves, Magnetohydrodynamics And Plasmas

Scientific paper

Phase mixing was introduced by Heyvaerts and Priest [1] as a mechanism for heating plasma in open magnetic field regions. Here we include a stratified density and a diverging background magnetic field. We present numerical and WKB solutions to describe the effect of stratification and divergence on phase mixing of Alfvén waves. It is shown that the decrease in density lengthens the oscillation wavelengths and thereby reduces the generation of transverse gradients. However, the divergence of the field lines shortens the wavelengths and thus enhances the generation of gradients. Furthermore we found that in a stratified atmosphere, ohmic heating is spread out over a greater height range whereas viscous heating is not strongly influenced by the stratification. A wavelet analysis indicated that the wavelet transform could provide us with information about the medium the waves are traveling through. .

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