Dissipation of non-linear Alfven waves.

Details Dissipation of non-linear Alfven waves. Dissipation of non-linear Alfven waves.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..299b&link_type=abstract

Astronomy and Astrophysics, v.308, p.299-308

Astronomy and Astrophysics

Astrophysics

16

Stars: Coronae, Mhd, Waves, Solar Wind, Sun: Corona

Scientific paper

By numerically solving the equations of magnetohydrodynamics in time and one spatial coordinate we show that non-linear effects lead to significantly increased dissipation rates for linearly polarised Alfven waves of high amplitude. The increased dissipation rate is a result of the appearance of current sheets at magnetic pressure minima during the evolution of the wave. We discuss the relevance of this mechanism for the energetics of solar and stellar coronae. The Alfven waves in the lower solar corona are of too low amplitude for this mechanism to be important, but it may be operative in the solar wind as well as in the coronae of late-type giants.

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