Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30.1107k&link_type=abstract
Planetary and Space Science, vol. 30, Nov. 1982, p. 1107-1115.
Astronomy and Astrophysics
Astronomy
25
Astronomical Spectroscopy, Energetic Particles, Ionospheric Ion Density, Mass Spectroscopy, Oxygen Ions, Venus Atmosphere, Mass Spectrometers, Neutral Gases, Particle Acceleration, Pioneer Venus Spacecraft, Planetary Ionospheres, Plasma Interactions, Solar Wind
Scientific paper
Ions (primarily O/+/) with spacecraft rest frame energies greater than 40 eV have been observed by the Pioneer Venus Neutral Mass Spectrometer. The signature occurs in about 13% of the 700 orbits examined, primarily near the ionopause and at all solar zenith angles. The energetic ions coincide in location with superthermal ions observed by the Ion Mass Spectrometer and more rarely occur in some of the plasma clouds observed by the Electron Temperature Probe. These observations in conjunction with measurements by the Plasma Wave Instrument near the ionopause suggest that the ions are accelerated out of ionospheric plasma by the shocked solar wind through plasma wave-particle interactions.
Brace Larry H.
Kasprzak Wayne T.
Niemann Hasso B.
Scarf Frederick L.
Taylor Harry A.
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