Data Set Information

 
Citation Kasprzak, W., PVO-V-ONMS-4-SUPERTHRMLOXYGN-12SEC-V1.0, PVO VENUS ONMS BROWSE SUPERTHERMAL OXYGEN 12 SECOND V1.0, NASA Planetary Data System, 1993.
Digital Object Identifier (DOI) 10.17189/1519824
Data Set Abstract The instrument has detected superthermal, energeticor fast ions whose energy exceeds 36 eV in the spacecraftframe of reference. These ions were observed in early orbitsduring measurements of the neutral density near periapsis, havean erratic and unpredictable signature, and occur at too high analtitude to be due to the neutral atmosphere. When the altitudeof periapsis increased above the point where sensible neutraldensity measurements could be made, the instrument was configuredspecifically to detect superthermal ions. In general, for orbitnumbers 1 to 645, data were taken from the RPA mode. The gasbackground signal with the filament on is about a factor of 10less in this mode than in non-RPA mode, resulting in a lowerdetection threshold. For orbit numbers above 923, the instrumentwas deliberately configured with the filament off and non-RPAmode data was used. For mass 16 the RPA voltage is about +3.8volts.
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    Additional Information
    Mission Information PIONEER VENUS
    Data Set Information PVO-V-ONMS-4-SUPERTHRMLOXYGN-12SEC-V1.0
    Instrument Host Information PVO
    Instrument Information ONMS
    Target Information VENUS