NSSDCA ID: 1969-053A-04
Mission Name: IMP-GThis experiment, which was similar to the University of Iowa experiment on Explorer 34, was designed to measure separately low-energy electron and proton intensities inside the magnetosphere and in the interplanetary region. The detector system consisted of a cylindrical electrostatic analyzer (LEPEDEA detector) and Bendix continuous channel multiplier (channeltron) array, and an Anton 213 GM tube designed to survey the intensities of electrons with E>40 keV in the outer magnetosphere. The electrostatic analyzer was capable of measuring the angular distributions and differential energy spectra of proton and electron intensities, separately, within 15 contiguous energy intervals over the energy ranges 25 eV to 47 keV and 33 eV to 57 keV. The analyzer accumulators were read out four times every 20.48 s. Each accumulation was about 480 ms long (spacecraft spin period was initially 2.2 s). A complete scan of the spectrum for four directions in a plane perpendicular to the spacecraft spin axis required 307.2 s. For each energy interval, the detector response for four approximately 60-deg swaths of the angular distribution was telemetered. The instruments performed normally until the spacecraft decayed from orbit on December 23, 1972.
Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
---|---|---|---|
Prof. Louis A. Frank | Other Investigator | University of Iowa | frank@iowasp.physics.uiowa.edu |
Prof. James A. Van Allen | Principal Investigator | University of Iowa |