Nonresonant absorption of shear Alfven waves

Details Nonresonant absorption of shear Alfven waves Nonresonant absorption of shear Alfven waves

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18...77s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Jan. 1991, p. 77-80.

Physics

2

Magnetic Field Configurations, Magnetohydrodynamic Waves, Plasma Acceleration, S Waves, Solar Corona, Solar Wind, Wave Propagation, Magnetic Compression, Space Plasmas

Scientific paper

Resonant absorption of shear Alfven waves is thought to be a likely candidate to explain heating of the solar corona and acceleration of the solar wind. A difficulty with the theory is that the absorption process is slow. Moreover, heating occurs in a very thin layer. A faster absorption mechanism is nonresonant absorption by compressional viscosity, in a curved magnetic field. Heating is nonresonant and is not localized to a narrow layer. The effect could be quite important where the solar coronal magnetic field is strongly curved, in the chromosphere. It could also be important on open field lines in the upper corona, where the compressional viscosity is large. It might imply that a significant part of outgoing Alfven waves are absorbed in the corona.

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