NSSDCA ID: 1964-060A-05
Mission Name: IMP-BThis 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 energies greater than 1 and 17 MeV, respectively. Both GM tubes were mounted parallel to the spacecraft spin axis. GM tube A detected electrons greater than 45 keV scattered off a gold foil. The acceptance cone for these electrons had a full-angle of 61 deg, and its axis of symmetry made an angle of 59.5 deg with the spacecraft spin axis. GM tube A responded omnidirectionally to electrons and protons with energies greater than 6 and 52 MeV, respectively. GM tube B looked directly into space through a hole in the spacecraft skin. The acceptance cone for GM tube B had a full-angle of 38 deg, and its axis of symmetry was parallel to the spacecraft spin axis. Omnidirectionally, GM tube B responded to electrons and protons with energies greater than 6 and 52 MeV, respectively. Directionally, GM tube B responded to electrons and protons with energies greater than 40 and 500 keV, respectively. Pulses from the ion chamber were accumulated for 326.08 s and read out once every 327.68 s. Counts from GM tube A were accumulated for 39.36 s and read out six times every 327.68 s. Counts from GM tube B were accumulated for 39.36 s and read out five times every 327.68 s. For further details, see Lin and Anderson, J. Geophys. Res., v. 71, p. 1827, 1966. 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 | |
---|---|---|---|
Prof. Kinsey A. Anderson | Principal Investigator | University of California, Berkeley | anderson@ssl.berkeley.edu |