Ion measurements during Pioneer Venus reentry: Implications for solar cycle variation of ion composition and dynamics

Details Ion measurements during Pioneer Venus reentry: Implications for solar cycle variation of ion composition and dynamics Ion measurements during Pioneer Venus reentry: Implications for solar cycle variation of ion composition and dynamics

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2735g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 23, p. 2735-2738

Physics

10

Mass Spectrometers, Molecular Ions, Planetary Ionospheres, Plasmas (Physics), Solar Cycles, Solar Planetary Interactions, Venus Atmosphere, Atmospheric Entry, Ion Concentration, Ionospheric Ion Density, Night, Pioneer Venus 1 Spacecraft, Variations

Scientific paper

During the final, low solar activity phase of the Pioneer Venus (PV) mission, the Orbiter Ion Mass Spectrometer (OIMS) measurements found all ion species, in the midnight-dusk sector, reduced in concentration relative to that observed at solar maximum. Molecular ion species comprised a greater part of the total ion concentration as O(+) and H(+) had the greatest depletions. The nightside ionospheric states were strikingly similar to the isolated solar maximum 'disappearing' ionospheres. Both are very dynamic states characterized by a rapidly drifting plasma and 30-100 eV superthermal O(+) ions.

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