The damping of the Alfven mode in stochastic astrophysical fluids

Details The damping of the Alfven mode in stochastic astrophysical fluids The damping of the Alfven mode in stochastic astrophysical fluids

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..874l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 874-882.

Astronomy and Astrophysics

Astrophysics

15

Astrophysics, Magnetohydrodynamic Waves, Plasma Dynamics, Solar Corona, Stochastic Processes, Wave Propagation, Cold Plasmas, Damping, Incompressible Fluids, Magnetic Field Configurations, Time Dependence

Scientific paper

The properties of coherent small-amplitude Alfven waves propagating in the presence of a strong mean background magnetic field in an infinitely conducting, inviscid, cold, incompressible, and turbulent plasma are investigated by using projection operator techniques. The coherent Alfven mode is shown to be damped owing to the background fluctuations, and the damping decrement is estimated for cases of relevence to MHD wave propagation in the solar corona. One significant consequence of these results is that long-wavelength Alfven modes may in fact be effectively damped on time scales of the order of the Alfven crossing time if the background atmosphere is only weakly unsteady.

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