PVO VENUS ONMS CALIBRATED SUPERTHERMAL OXYGEN HIGH RES. V1.0

This dataset has one point for each point measured, that wentinto a successful data fitting for that time interval. The individualflux and density values are computed by dividing each data value bythe value of the fitting function at the corresponding time. 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.