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Title: A primitive kinetic-fluid model for quasi-parallel propagating magnetohydrodynamic waves

The extension and limitation of the existing one-dimensional kinetic-fluid model (Vlasov-MHD (magnetohydrodynamic) model), which has been used to analyze parametric instabilities of parallel propagating Alfvén waves, are discussed. The inconsistency among the given velocity distribution functions in the past studies is resolved through the systematic derivation of the multi-dimensional Vlasov-MHD model. The linear dispersion analysis of the present model indicates that the collisionless damping of the slow modes is adequately evaluated in low beta plasmas, although the deviation between the present model and the full-Vlasov theory increases with increasing plasma beta and increasing propagation angle. This is because the transit-time damping is not correctly evaluated in the present model. It is also shown that the ponderomotive density fluctuations associated with the envelope-modulated quasi-parallel propagating Alfvén waves derived from the present model is not consistent with those derived from the other models such as the Landau-fluid model, except for low beta plasmas. The result indicates the present model would be useful to understand the linear and nonlinear development of the Alfvénic turbulence in the inner heliosphere, whose condition is relatively low beta, while the existing model and the present model are insufficient to discuss the parametric instabilities of Alfvén waves inmore » high beta plasmas and the obliquely propagating waves.« less
Authors:
 [1] ;  [2] ;  [3]
  1. Faculty of Human Development, University of Toyama, 3190 Toyama City, Toyama 930-8555 (Japan)
  2. Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8601 (Japan)
  3. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601 (Japan)
Publication Date:
OSTI Identifier:
22227934
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALFVEN WAVES; ASTROPHYSICS; BOLTZMANN-VLASOV EQUATION; DAMPING; DISTRIBUTION FUNCTIONS; FLUCTUATIONS; HELIOSPHERE; HIGH-BETA PLASMA; LOW-BETA PLASMA; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; ONE-DIMENSIONAL CALCULATIONS; PARAMETRIC INSTABILITIES; PLASMA FLUID EQUATIONS; PLASMA WAVES; PONDEROMOTIVE FORCE; SOLAR WIND; TURBULENCE