Physics – Plasma Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..341p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 341-351.
Physics
Plasma Physics
69
Cosmic Dust, Interstellar Gas, Interstellar Matter, Magnetohydrodynamic Waves, Nebulae, Dissipation, Ionized Gases, Plasma Physics, Wave Propagation
Scientific paper
The propagation of circularly polarized Alfven waves in dusty, weakly ionized media consisting of three gaseous fluids and of one size of grains that are either neutral or singly ionized is numerically investigated. For a molecular hydrogen number density of 10,000/cu cm, a magnetic field strength of 0.0001 G, and a temperature of 20 K, the waves are well coupled when the wavelengths exceed about 1 pc. The grains can reduce the minimum wavelength for coupled waves to about 0.1 pc and the dissipation rates of well-coupled small-amplitude waves by an order of magnitude. The speeds and dissipation rates of decoupled Alfven waves with frequencies well above 0.01/yr and wavelengths well below 0.01 pc are altered greatly over a wide range of frequencies by the presence of grains. In particular, right-handed circularly polarized waves are affected strongly by gyroresonance and cutoff effects.
Hartquist Thomas W.
Havnes Ove
Morfill Gregor E.
Pilipp W.
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