Generation of magnetohydrodynamic waves near giant molecular clouds

Details Generation of magnetohydrodynamic waves near giant molecular clouds Generation of magnetohydrodynamic waves near giant molecular clouds

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..816d&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, Nov. 1985, p. 816-824) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, Nov.-Dec

Astronomy and Astrophysics

Astronomy

3

Cosmic Rays, Magnetohydrodynamic Waves, Molecular Clouds, Proton Density (Concentration), Wave Generation, Alpha Particles, Particle Motion, Proton Energy

Scientific paper

The conditions under which MHD waves can be generated by cosmic-ray protons or alpha particles penetrating giant molecular clouds (GMCs) are investigated analytically, using the diffusion approximation to describe the particle motion in and near the GMC. Numerical results for a model GMC of radius 10 pc, temperature 20 K, and neutral-particle density 800/cu cm in an intercloud medium of temperature 7000 K and density 0.4/cu cm, and for a number of actual GMCs and complexes are presented in tables and graphs and discussed. It is found that MHD waves are most likely to be excited near dense compact clouds in rarefied media, so that they should be found near most GMCs unless GMC or intercloud turbulence lowers the diffusion coefficient below about (1-10) x 10 to the 26th sq cm/s. It is shown that the MHD-wave-generation process might also be suppressed if the near-cloud environment were relatively dense (as in some clumps in molecular-cloud complexes) or deficient in low-energy protons.

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