Ionosphere of Venus - First observations of day-night variations of the ion composition

Details Ionosphere of Venus - First observations of day-night variations of the ion composition Ionosphere of Venus - First observations of day-night variations of the ion composition

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...205...96t&link_type=abstract

Science, vol. 205, July 6, 1979, p. 96-99.

Computer Science

3

Diurnal Variations, Ionospheric Composition, Ionospheric Ion Density, Nocturnal Variations, Oxygen Ions, Planetary Ionospheres, Venus Atmosphere, Abundance, Carbon Dioxide, F Region, Hydrogen Ions, Mass Spectroscopy, Molecular Ions, Pioneer Venus 1 Spacecraft, Vertical Distribution, Solar Wind, Nitrogen, Magnetic Fields, Ionopause, Venus, Observations, Oxygen, Ionosphere, Composition, Mass Spectrometers, Nightside, Dayside, Abundance, Transport, Orbiter Ion Mass Spectrometer (Oims), Ions

Scientific paper

Preliminary observations of day-night variations in the ion composition of the ionosphere of Venus, obtained by the Pioneer Venus Orbiter ion mass spectrometer experiment, are reported. A remarkable abundance and extent of ionization in the deep regions of the nightside ionosphere was observed, in spite of the long Venus night. A comparison of dayside and nightside ion distributions reveals a nightside composition similar in several respects to that of the dayside, with the ions O(+) and O2(+) forming the nightside F 2 and F 1 regions, respectively, as in the dayside. Important differences include a greater abundance of low-latitude ionization in the nightside, a significant increase of H(+) and NO(+) ions with increasing solar zenith angle, and extreme dynamic variability of the nightside region above 160 km. Ion composition data support the view that the nightside ionosphere can be maintained by the transport of ionization from the dayside.

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