Pioneer Venus Orbiter (PVO) processed data from the retarding potential analyzer (ORPA), including thermal and superthermal electrons, ions, and a key parameters file for all 5055 orbits (Dec 5, 1978 - Oct 7, 1992).

 
Citation Knudsen, W.C., PVO-V-ORPA-5-ELE/ION/PHOTO/UADS-V1.0, PVO RPA PROC THERM ELEC, ION, PHOTOELEC, LOW RES. V1.0, NASA Planetary Data System, 1997.
Digital Object Identifier (DOI) 10.17189/1519828
Data Set Abstract The ORPA processed data consist of 4 file types: high resolution thermal electrons, high resolution superthermal electrons, high resolution ions, and a key parameters file at 12 second sampling.
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    Additional Information
    Mission Information PIONEER VENUS
    Data Set Information PVO-V-ORPA-5-ELE/ION/PHOTO/UADS-V1.0
    Instrument Host Information PVO
    Instrument Information ORPA
    Target Information VENUS