Hydromagnetic wave dissipation in molecular clouds

Details Hydromagnetic wave dissipation in molecular clouds Hydromagnetic wave dissipation in molecular clouds

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..511z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 511-518. Research supported by the University of Cal

Astronomy and Astrophysics

Astrophysics

94

Magnetohydrodynamic Waves, Molecular Clouds, Supersonic Speed, Wave Attenuation, Constraints, Magnetic Fields, Neutral Particles, Propagation Modes, Shock Wave Propagation

Scientific paper

The damping of long wavelength, hydromagnetic waves in molecular cloud environments is studied with the aim of determining whether the supersonic motions observed in such clouds are likely to be due to the waves. It is found that Alfven waves propagating parallel to the average magnetic field are the longest lived wave modes. Such waves can typically survive for as long as one-million years if the wavelength is as long as a few tenths of a pc and the magnetic field is 0.1-1 milligauss. Nonlinear steepening of the waves followed by ion-neutral friction in the steepened wave profiles appears to be the most effective damping mechanism.

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