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  • PLASMA PHYSICS  (1)
  • SOLAR PHYSICS  (1)
  • 1
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    Nearly incompressible magnetohydrodynamics at low Mach number (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The relationship between compressible and incompressible MHD turbulence at low plasma-frame acoustic Mach numbers is investigated analytically, with a focus on the range of validity of the pseudosound model proposed by Lighthill (1952). The derivation and asymptotic analysis procedures are explained in detail, and consideration is given to the role of number-density fluctuations and Alfven waves in the nearly incompressible model at low Mach numbers. The results are shown to be consistent with the turbulent-density spectrum theory of Montgomery et al. (1987) and applicable to solar-wind Alfven-wave turbulence.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 31; 3634-364
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Nearly incompressible magnetohydrodynamics, pseudosound, and solar wind fluctuations (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: 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.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 5421-543
    Format: text
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    NASA TECHNICAL REPORTS
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