Computer simulation of the Farley-Buneman instability and anomalous electron heating in the auroral ionosphere

Details Computer simulation of the Farley-Buneman instability and anomalous electron heating in the auroral ionosphere Computer simulation of the Farley-Buneman instability and anomalous electron heating in the auroral ionosphere

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9993m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9993-10000.

Computer Science

Sound

22

Auroral Ionization, Collisional Plasmas, Computerized Simulation, Ionospheric Heating, Magnetohydrodynamic Stability, Elastic Scattering, Electric Fields, Electron Energy, Fourier Series, Wave Propagation

Scientific paper

The nonlinear saturation of the Farley-Buneman instability in a collisional plasma is studied by a 2 1/2 dimensional electrostatic particle simulation which includes inelastic and elastic collisions of electrons and elastic collision of ions with neutrals. In the simulation, a uniform convection electric field is applied externally so that the relative velocity between the electrons and ions is greater than the ion sound speed and destabilizes the instability. A nonlinear frequency shift from higher to lower frequencies and diffusion of the wave spectrum in two dimensional wave number space are found. It is found that the dominant mechanism for electron heating is due to an enhanced effective electron collision frequency and hence enhanced resistive heating as suggested by Primdahl (1986) and not due to the heating of electrons by the electric field of the waves parallel to the magnetic field. For the ionospheric conditions discussed by Schlegel and St.-Maurice (1981)an anomalous heating rate of about 4 x 10 to the 7th W/cu cm is found.

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