Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9613807y&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 13,807-13,813.
Physics
11
Absorption Spectra, Cold Plasmas, Magnetohydrodynamic Shear Heating, Plasma Resonance, Solar Corona, Surface Waves, Magnetohydrodynamic Waves, Plasma-Electromagnetic Interaction, Velocity Distribution, Wave Dispersion
Scientific paper
Magnetohydrodynamic (MHD) surface waves can decay via a process called 'resonance absorption', which is a candidate for solar coronal heating. Recently, the effects of velocity shear on the rate of resonance absorption of incompressible MHD surface waves was studied. The theory is extended to a compressible but cold plasma, which is the case more applicable to the solar corona. The rate of resonance absorption can be either increased or decreased significantly by velocity shear. There can exist resonances which lead to instability of the surface mode at values of the velocity shear below the Kelvin-Helmholtz threshold. However, the resonance instability usually occurs when the density ratio across the surface is less than about 0.1. The resonant instability can therefore be unimportant in the solar corona, though resonance absorption remains an attractive possibility for corona heating.
Hollweg Joseph V.
Yang Guang
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