Effects of steady flow on magnetoacoustic-gravity surface waves

Details Effects of steady flow on magnetoacoustic-gravity surface waves Effects of steady flow on magnetoacoustic-gravity surface waves

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..255v&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Other

3

Mhd Surface Waves, Steady Flow, Convective Zone, Chromosphere

Scientific paper

We developed the linearized theory for the parallel propagation of magnetoacoustic-gravity (MAG) surface waves at an isothermal interface of a uniformly magnetised plasma above a field-free plasma with a constant steady flow parallel to the field lines. The dispersion relation is derived and studied in detail. We found that the effect of flow is twofold: the frequencies of the modes and the permitted regions of propagation are both shifted causing some modes to disappear, and others to appear. The backward propagating slow mode changes its direction of propagation and couples to its forward propagating counterpart giving rise to an upper bound of the permitted wavenumber range for propagation.

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