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  • 1
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    Reversible electron heating vs. wave-particle interactions in quasi-perpendicular shocks (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The energy necessary to explain the electron heating in quasi-perpendicular collisionless shocks can be derived either from the electron acceleration in the d.c. cross shock electric potential, or by the interactions between the electrons and the waves existing in the shock. A Monte Carlo simulation has been performed to study the electron distribution function evolution through the shock structure, with and without particle diffusion on waves. This simulation has allowed us to clarify the relative importance of the two possible energy sources; in particular it has been shown that the electron parallel temperature is determined by the d.c. electromagnetic field and not by any wave-particle-induced heating. Wave particle interactions are effective in smoothing out the large gradients in phase space produced by the 'reversible' motion of the electrons, thus producing a 'cooling' of the electrons.
    Keywords: PLASMA PHYSICS
    Type: Nuovo Cimento C, Serie 1 (ISSN 0390-5551); 15 C; 5; p. 607-619.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Test particle propagation in magnetostatic turbulence. 1. Failure of the diffusion approximation (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The equation which governs the quasi-linear approximation to the ensemble and gyro-phase averaged one-body probability distribution function is constructed from first principles. This derived equation is subjected to a thorough investigation in order to calculate the possible limitations of the quasi-linear approximation. It is shown that the reduction of this equation to a standard diffusion equation in the Markovian limit can be accomplished through the application of the adiabatic approximation. A numerical solution of the standard diffusion equation in the Markovian limit is obtained for the narrow parallel beam injection. Comparison of the diabatic and adiabatic results explicitly demonstrates the failure of the Markovian description of the probability distribution function. Through the use of a linear time-scale extension the failure of the adiabatic approximation, which leads to the Markovian limit, is shown to be due to mixing of the relaxation and interaction time scales in the presence of the strong mean field.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-X-71208 , X-692-76-207
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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