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  • 1
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    The onset of Alfvenic turbulence (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An investigation is conducted on how low-frequency MHD oscillations in a warm plasma may undergo a transition from a coherent state to one of turbulence. A driven/dissipative derivative nonlinear Schroedinger equation is derived from the fluid equations. The time evolution of an arbitrary spectrum of waves is analyzed in the case where one k-mode is unstable, with the rest damped. It is found that the transition from order to chaos in the driven/dissipative system is correlated with the existence or absence of 'breathing' solitons in the associated conservative system.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 30; 1371-138
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Chaotic behaviour of high Mach number flows (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The stability of the super-Alfvenic flow of a two-fluid plasma model with respect to the Mach number and the angle between the flow direction and the magnetic field is investigated. It is found that, in general, a large scale chaotic region develops around the initial equilibrium of the laminar flow when the Mach number exceeds a certain threshold value. After reaching a maximum the size of this region begins shrinking and goes to zero as the Mach number tends to infinity. As a result high Mach number flows in time independent astrophysical plasmas may lead to the formation of 'quasi-shocks' in the presence of little or no dissipation.
    Keywords: PLASMA PHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 148; 1 Ju
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    NASA TECHNICAL REPORTS
  • 3
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    The evolution of cross helicity in driven/dissipative two-dimensional magnetohydrodynamics (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The paper presents a series of incompressible two-dimensional simulations of driven/dissipative MHD turbulence where the amount of correlation between the kinetic and magnetic forcing is regulated, thereby controlling the amount of cross helicity injection. It is shown that correlated forcing provides a strong source of magnetofluid cross helicity. The clear appearance of the 'minority species effect,' which is the most striking and systematic effect during this driven dynamic alignment process, is discussed.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 31; 2171-218
    Format: text
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    NASA TECHNICAL REPORTS
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