NSSDCA ID: 1967-051A-02
Mission Name: IMP-FThe instrumentation for this experiment consisted of a 4-in., Neher-type ionization chamber and two Lionel type 205 HT Geiger-Mueller (GM) tubes. The ion chamber responded omnidirectionally to electrons above 0.7 MeV and protons above 12 MeV. Both GM tubes were mounted parallel to the spacecraft spin axis. GM tube A detected electrons above 45 keV that were scattered from a gold foil. The acceptance cone for these electrons had a 70-deg full-angle and an axis of symmetry that was 20 deg off the spacecraft spin axis. GM tube B responded to electrons and protons above 22 and 300 keV, respectively, in an acceptance cone of 70-deg full-angle centered at the spin direction. Both GM tubes responded omnidirectionally to electrons and protons of energies above 2.5 and 50 MeV, respectively. Pulses from the ion chamber and counts from each GM tube were accumulated for 9.92 s and read out every 10.24 s. The time between the first two ion chamber pulses in an accumulation period was also telemetered. This experiment performed normally from launch through September 8, 1967, when GM tube A failed. On November 5, 1967, GM tube B failed and the experiment was terminated. For further details, see Lin, Solar Physics, v. 12, p. 266, 1970. NSSDC has all the useful data that now exist.
Mass: 7.394 kg
Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
---|---|---|---|
Mr. George H. Pitt | Other Investigator | University of California, Berkeley | |
Prof. Kinsey A. Anderson | Principal Investigator | University of California, Berkeley | anderson@ssl.berkeley.edu |