Implications of flow angle stabilization on coherent E region spectra

Details Implications of flow angle stabilization on coherent E region spectra Implications of flow angle stabilization on coherent E region spectra

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913203j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A7, p. 13,203-13,208

Physics

3

Acoustic Velocity, Dispersion, Electric Fields, Equatorial Electrojet, Flow Geometry, Magnetohydrodynamic Stability, Spectral Energy Distribution, Coherence, Computerized Simulation, E Region, Plasma Turbulence, Power Spectra

Scientific paper

Recent perpendicular particle simulations of the Farley-Buneman instability show good agreement with the linear dispersion relation: the phase velocity is proportional to the electric field. This is in contrast with the usually quoted nonlinear theory, which states that the phase velocity at any direction does not rise much above the ion acoustic velocity C(sub s). However, the simulations also produce a flow angle shift in the spatial power spectrum such that the most intense modes have phase velocities close to C(sub s). Using simple analytical formulae based on these simulations, we synthesize coherent spectra assuming a turbulent microstructure of the scattering volume. In this way, the observed type 1 characteristics can be reproduced, and also spectra similar to type 4 can be generated. A new interpretation of the C(sub s) saturation observed in the equatorial electrojet is thus presented, and the difference between equatorial and auroral coherent spectra becomes understandable.

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