NSSDCA ID: 1963-046A-05
Mission Name: IMP-AThe instrumentation for this experiment, designed to measure fluxes of geomagnetically trapped particles, consisted of a 7.6-cm-diameter, Neher-type ionization chamber and two Anton 223 Geiger-Mueller (GM) tubes. The ion chamber responded to electrons and protons with E>1 and E>17 MeV, respectively. Both GM tubes were mounted parallel to the spacecraft spin axis. One GM tube detected electrons, with E>45 keV, scattered off a gold foil. The acceptance cone for these electrons had a 61-deg full-angle, and its axis of symmetry made an angle of 59.5 deg with the spacecraft spin axis. This GM tube responded omnidirectionally to electrons and protons with E>6 and E>52 MeV, respectively. The second GM tube had no direct access to the space environment and responded omnidirectionally to background electrons and protons with E>6 and E>52 MeV, respectively. Pulses from the ion chamber were accumulated for 326.08 s and read out once every 327.68 s. Counts from the first GM tube were accumulated for 39.36 s and read out six times every 327.68 s. Counts from the second GM tube were accumulated for 39.36 s and read out five times every 327.68 s. This experiment performed normally from launch through May 10, 1965. For further details, see Anderson et al., J. Geophys. Res., v. 70, p. 1039, 1965. NSSDC has all the useful data that now exist.
Mass: 0.807 kg
Power (avg): 0.2 W
Bit rate (avg): 0.009703 kbps
Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
---|---|---|---|
Mr. George H. Pitt | General Contact | University of California, Berkeley | |
Prof. Kinsey A. Anderson | Principal Investigator | University of California, Berkeley | anderson@ssl.berkeley.edu |