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  • Other Sources  (3)
  • 1990-1994  (3)
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  • 1
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    Magnetic field-aligned electric potentials in nonideal plasma flows (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The electric field component parallel to the magnetic field arising from plasma flows which violate the frozen-in field condition of ideal magnetohydrodynamics is discussed. The quantity of interest is the potential U = integral E parallel ds where the integral is extended along field lines. It is shown that U can be directly related to magnetic field properties, expressed by Euler potentials, even when time-dependence is included. These results are applicable to earth's magnetosphere, to solar flares, to aligned-rotator models of compact objects, and to galactic rotation. On the basis of order-of-magnitude estimates, these results support the view that parallel electric fields associated with nonideal plasma flows might play an important role in cosmic particle acceleration.
    Keywords: PLASMA PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 380; 293-301
    Format: text
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  • 2
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    Nonlinear current sheet formation in ideal plasmas (1994)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: We present a numerical study of the formation of current sheets in ideal plasmas. First we confirm the development of singular current sheets in a one-dimensional model. In a second step we extend the analysis to two-dimensional equilibria. Here it is found that the resulting structures are quiet insensitive to the boundary conditions. For the special case of a magnetotail like equilibrium it will be shown that the resulting current distribution provides a possibility to understand the onset of a localized anomalous resistivity from a macroscopic point of view. Furthermore, the resulting structures provide an explanation for the dramatic decrease of the thickness of the current sheet in the magnetotail prior to the onset of geomagnetic substorms.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; A11; p. 21,241-21,248
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    On the cause of thin current sheets in the near-Earth magnetotail and their possible significance for magnetospheric substorms (1993)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: The formation of thin current sheets in the near-Earth magnetotail during substorm growth phases is addressed in terms of a simple model. An appropriate part of the unperturbed magnetotail is represented by a plane sheet model. Perturbations are applied to the upper and to the left boundaries, representing the magnetopause and the near-Earth tail boundary, where the perturbation at the latter models the interaction between the tail and the inner magnetosphere. Treating the perturbation as ideal (dissipation-free), we found that singular current sheets develop in the midplane of the tail. The analytical results are explored numerically. Using realistic dimensions of the domain considered, the influence of the earthward boundary on current sheet formation dominates. It is argued that current sheet formation of this type plays an important role in the processes associated with the onset of magnetospheric substorms.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A9; p. 15,477-15,485.
    Format: text
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    NASA TECHNICAL REPORTS
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