Title :
Pioneer Venus Orbiter Planar Retarding Potential Analyzer Plasma Experiment
Author :
Knudsen, William C. ; Spenner, Karl ; Bakke, Jack ; Novak, Vit
Author_Institution :
Lockheed Palo Alto Research Laboratory, Palo Alto, CA 94304
Abstract :
The retarding potential analyzer (RPA) on the Pioneer Venus Orbiter Mission measures most of the thermal plasma parameters within and near the Venusian ionosphere. Parameters include total ion concentration, concentrations of the more abundant ions, ion temperatures, ion drift velocity, electron temperature, and low-energy (0-50 eV) electron distribution function. Several functions not previously used in RPA´s were developed and incorporated into this instrument to accomplish these measurements on a spinning spacecraft with a small bit rate. The more significant functions include automatic electrometer ranging with background current compensation; digital, quadratic retarding potential step generation for the ion and low-energy electron scans; a current sampling interval of 2 ms throughout all scans; digital logic inflection point detection and data selection; and automatic ram direction detection.
Keywords :
Distribution functions; Electron mobility; Extraterrestrial measurements; Instruments; Ionosphere; Plasma measurements; Plasma temperature; Spinning; Temperature distribution; Venus;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.1980.350261