Computer Science – Sound
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5421m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5421-5435.
Computer Science
Sound
68
Magnetohydrodynamic Waves, Plasma Density, Plasma Pressure, Solar Wind, Interplanetary Medium, Mach Number, Magnetohydrodynamic Turbulence
Scientific paper
The results of previous investigations of low Mach number MHD density fluctuations and associated dynamical structure of nearly compressible polytropic MHD are reviewed. The recipe for computing 'pseudosound' density fluctuations is generalized to give rise to formulas expressing the density spectrum in terms of the incompressible field variables in homogeneous MHD turbulence with arbitrary rotational symmetry and with arbitrary magnetic and cross helicity spectra. The known observational consequences of the polytropic theory are summarized and several tests of the theory using Voyager data are presented. Finally, compressible two-dimensional MHD simulation results are presented which appear to have a direct bearing on interpretation of the observations.
Brown Michael R.
Ghosh Sanjoy
Klein Larry W.
Matthaeus William H.
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