Small-scale density irregularities in the nightside Venus ionosphere - Comparison of theory and observations

Details Small-scale density irregularities in the nightside Venus ionosphere - Comparison of theory and observations Small-scale density irregularities in the nightside Venus ionosphere - Comparison of theory and observations

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3079h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E2, p. 3079-3086.

Physics

6

Night, Planetary Ionospheres, Plasma Density, Venus Atmosphere, Atmospheric Electricity, Ionospheric Drift, Venus, Ionosphere, Density, Theoretical Studies, Comparisons, Source, Electrical Field, Nightside, Stability, Boundaries, Magnetic Field, Plasma, Spacecraft Observations, Pvo Mission, Oefd Instrument, Origin, Parameters, Calculations, Models, Electrons, Oetp Instrument, Whistlers, Wavelengths, Turbulence, Doppler Methods, Lightning

Scientific paper

The theory of the lower-hybrid-drift instability is compared with observations of plasma density irregularities. Marginal stability boundaries (gamma = 0) for the lower-hybrid-drift instability and the occurrence of small-scale density fluctuations are presented as a function of magnetic field B and density n. For plasma density gradient scale lengths in the range 2-10 km, 80-85 percent of the density fluctuations lie in the unstable B/n parameter regime (gamma greater than 0). Stability boundaries for the onset of instability at a wavelength for which the Pioneer Venus Orbiter could measure a Doppler-shifted frequency of 100 Hz are presented. The conditions on B and n for instability in this situation are more stringent than those for marginal stability, especially at low densities (n less than or equal to 5000/cu cm). In general, the instability is most likely to be active in regions of low beta: high magnetic field strength and low density, as found in ionospheric holes or troughs.

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