Venus nightside ionospheric troughs - Implications for evidence of lightning and volcanism

Details Venus nightside ionospheric troughs - Implications for evidence of lightning and volcanism Venus nightside ionospheric troughs - Implications for evidence of lightning and volcanism

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.7415t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Aug. 1, 1985, p. 7415-7426.

Physics

36

Density Distribution, Ionospheric Ion Density, Lightning, Night Sky, Planetary Ionospheres, Venus Atmosphere, Volcanoes, Mass Spectrometers, Pioneer Venus 1 Spacecraft, Plasma Waves, Surface Properties, Troughs, Venus Surface, Whistlers, Venus, Nightside, Ionosphere, Lightning, Volcanism, Spectrometry, Orbiter Ion Mass Spectrometer, Pioneer Venus, Orbiter, Pvo, Density, Gradients, Ions, Flux, Latitude, Longitude, Altitude, Boundaries, Description, Comparisons, Distribution, Interactions, Solar Wind, Magneti

Scientific paper

Although corroborating optical evidence of lightning in the Venus atmosphere has not been provided by the PVO star tracker instrument, the tentative evidence from the electric field results has been accepted rather widely. However, in this paper the authors present an alternative interpretation of the plasma results. They show that prominent examples of the plasma waves that have previously been specifically attributed to lightning are associated with distinct nightside ionization troughs. They argue that the nightside troughs, like the dayside ionopause, are signatures of the close interaction of the ionosphere with the ionosheath/solar wind. Further, the authors show that the distribution of the nightside ion troughs, relative to the surface topography, is very similar to that attributed to the 100-Hz electric field disturbances and that this is most likely a coincidental result of the relationship between the PVO orbit, the planetary rotation, and the magnetic field draping geometry.

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