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  • 1980-1984  (4)
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  • 1
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    Stability of electron distributions within the Earth's bow shock (1983)
    American Geophysical Union
    Details
    Publication Date: 1983-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Stability of electron distributions within the earth's bow shock (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The present examination of the linear Vlasov stability of a class of electron velocity distributions modeling those observed within the earth's bow shock is restricted to electrostatic waves propagating parallel to the ambient magnetic field B. Two instabilities are identified as driven by free energy in the direction parallel to B: an ion acoustic wave with real frequency below the ion plasma frequency, and an electron acoustic wave whose real frequency is several times the ion plasma frequency. Unstable wave characteristics are in accord with the trend of the observed electrostatic waves toward polarization parallel to the magnetic field. The instabilities identified may contribute to electron dissipation in collisionless shocks.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 88; Apr. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Pedersen density drift instabilities (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper describes the linear kinetic theory of electrostatic-drift instabilities driven by Pedersen and density-drift velocities. The model uses a uniform magnetic field B; a weak, uniform density gradient in the x direction; and a weak, uniform electric field in the y direction. Weak charged-neutral collisions are represented by the addition of BGK model terms to the Vlasov equation. The resulting local dispersion equation is used to study the properties of the associated instabilities at ka(i) greater than about 1 (where k is the wave number and a(i) is the ion gyroradius). Results show that the E x B gradient drift instability at ka(i) = about 1 may grow in the auroral ionosphere primarily in the vicinity of 200 km and only if the electron density is sufficiently small.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; 10104-10
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Density drift instabilities and weak collisions (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A model is developed which describes the effects of weak collisions on the linear kinetic theory of electrostatic density drift instabilities. A dispersion equation valid at all frequencies and wave numbers is derived using the assumptions of a weak, uniform density gradient; a uniform magnetic field; and the BGK collision operator with a modification of the local approximation. The properties of the universal and collisional density drift instabilities at maximum growth rates are examined in detail. The thresholds of the instabilities are examined for an ionospheric model which includes ion-neutral, electron-neutral, and electron-ion collisions, and are compared with the threshold of the lower hybrid density drift instability. It is concluded that the k to the -5th short wavelength density power spectra observed above 280 km in the PLUMEX experiment are due to the effects of the universal density drift instability.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 88; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
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