Stability of electron distributions within the earth's bow shock

Details Stability of electron distributions within the earth's bow shock Stability of electron distributions within the earth's bow shock

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.3035t&link_type=abstract

Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 3035-3045.

Physics

43

Bow Waves, Earth Magnetosphere, Electron Distribution, Geomagnetism, Magnetohydrodynamic Stability, Shock Waves, Collisionless Plasmas, Earth Environment, Electron Energy, Electron Plasma, Electrostatic Waves, Ion Acoustic Waves, Plasma Frequencies, Vlasov Equations, Wave Dispersion

Scientific paper

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.

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