A laboratory investigation of the high-frequency Farley-Buneman instability

Details A laboratory investigation of the high-frequency Farley-Buneman instability A laboratory investigation of the high-frequency Farley-Buneman instability

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1698k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1698-1704. Navy-supported research. Previously annou

Physics

8

E Region, Earth Ionosphere, Electric Fields, Electrostatic Waves, Ionospheric Disturbances, Ionospheric Heating, Auroral Electrojets, Backscattering, Electrostatic Probes, Equatorial Electrojet, Geomagnetism, High Frequencies, Ion Acoustic Waves, Ionospheric Drift, Ionospheric Electron Density, Ionospheric Propagation, Spectra, Stability

Scientific paper

A laboratory investigation of the high-frequency Farley-Buneman instability is described. The instability was studied theoretically and is predicted to occur in the low E region of the ionosphere when the E/B drift velocity of the electrons relative to the ions is several times Cs, the ion-acoustic speed. In the experiments, an increase of the electric field well above the Lee threshold merely enhances the general power level of the fluctuations but does not effect appreciably their spectral shape. The observed frequency spectra fall-off in all cases very rapidly with increasing frequency, with a spectral shape of the type P(f) alpha 1f to the 3.5 power. This result has negative implications for a recently proposed mechanism of anomalous wave electron heating in the lower E region of the ionosphere.

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