Polarization of the impulsive signals observed in the nightside ionosphere of Venus

Details Polarization of the impulsive signals observed in the nightside ionosphere of Venus Polarization of the impulsive signals observed in the nightside ionosphere of Venus

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9622741s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 25, 1991, p. 22,741-22,752.

Physics

12

Planetary Ionospheres, Plasma Waves, Polarization (Waves), Venus Atmosphere, Lightning, Pioneer Venus 2 Spacecraft, Planetary Magnetic Fields, Time Series Analysis, Whistlers

Scientific paper

The impulsive plasma wave bursts detected by the Pioneer Venus Orbiter electric field detector in the nightside ionosphere of Venus have been attributed to atmospheric lightning. However, it has also been argued that the wave bursts are generated locally by plasma instabilities. The waves associated with local instabilities are most probably electrostatic in nature, while lightning-generated waves should be whistler mode waves, at least at the lowest frequencies. It is shown that for typical ionospheric parameters the whistler mode wave electric field should be polarized predominantly perpendicular to the ambient magnetic field. It is shown that the 100-Hz waves are polarized perpendicular to the ambient magnetic field provided the data are restricted to those intervals in which the magnetic field is sufficiently far from horizontal to allow vertical propagation within the whistler mode resonance cone. The 100-Hz waves detected outside of the resonance cone are polarized parallel to the magnetic field, as are the waves at higher frequency. The waves consequently fall into two classes: whistler mode waves which are most likely due to atmospheric lightning, and a mode that is polarized parallel to the ambient field. This latter mode may be analogous to the anomalous parallel polarized wave fields detected in the terrestrial ionosphere above thunderstorms.

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