NSSDCA ID: 1971-019A-06
Mission Name: IMP-IThis experiment, which was used to study the acceleration of electrons at the sun and their ejection into interplanetary space, consisted of four detectors. Two of these were GM tubes with viewing directions of 170 deg with respect to the spacecraft spin axis. One tube responded to electrons with energies greater than 20 keV that were backscattered off a gold foil. The 20-keV electron data were accumulated and read out every 10.24 s. The other GM tube directly observed electrons and protons with energies greater than 18 and 250 keV, respectively. This type of data was accumulated and read out every 5.12 s. The third detector, a telescope consisting of three semiconductors, had a viewing direction of 170 deg with respect to the spacecraft spin axis. This detector responded to electrons and protons in the energy intervals 18 to 450 keV and 0.04 to 2 MeV, respectively. Electron data from this detector were accumulated in four contiguous logarithmically equispaced energy channels for 5.12 s and read out at the end of each time interval. In addition, a 64-channel, pulse-height analysis was performed on the detector counts, and this information was telemetered every 163.84 s. Proton data from this detector was accumulated and read out every 20.48 s. The fourth detector consisted of two semiconductors with a viewing direction perpendicular to the spacecraft spin axis. This detector responded to electrons with energies between 47 and 350 keV that were backscattered off a gold foil. Counts of 47- to 350-keV electrons and 80- to 350-keV electrons were accumulated in each of 16 and 4 equiangular sectors, respectively, during successive 20.48-s intervals, and they were read out at the end of each interval. The experiment functioned normally. NSSDC has all of the available data.
Mass: 3 kg
Bit rate (avg): 0.0127 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 |