Observations of energetic ions on the nightside of Venus

Details Observations of energetic ions on the nightside of Venus Observations of energetic ions on the nightside of Venus

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..291k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 291-298.

Physics

21

Ion Temperature, Mass Spectroscopy, Night, Planetary Ionospheres, Satellite Observation, Venus Atmosphere, Energetic Particles, Ionospheric Ion Density, Oxygen Ions, Pioneer Venus 1 Spacecraft, Venus, Nightside, Energetic Particles, Ions, Pioneer Venus Orbiter, Pvo, Spacecraft Observations, Energy, Onms, Neutral Mass Spectrometer, Oxygen, Altitude, Composition, Thermal Properties, Flux, Density, Distribution, Diagrams, Calculations, Laboratory Studies

Scientific paper

Ions with energy greater than 40 eV have been measured on the nightside of Venus by the Pioneer Venus orbiter neutral mass spectrometer (ONMS). For periapsis altitudes beyond 1500 km, they are confined to solar zenith angles greater than 120 deg. The nightside energetic ion composition at 2000 km resembles the nightside thermal ion composition occurring at 1000 km with the dominant species being O(+). Postflight laboratory calibrations performed on the ONMS backup unit have been used to estimate the energetic O(+) ambient flux and density. The direction from which the energetic ions appear to be coming can be determined because the ONMS is mounted at an angle with respect to the spin axis of the spacecraft. Both tailward and antitailward components of the apparent ion flow are exhibited when projected into the ecliptic plane. The major component of the apparent ion flow is observed perpendicular to the ecliptic plane.

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