Particle Detectors
The Charged Particle Measurement Experiment (CPME) was designed and built at JHU/APL. The original Principal Investigator was S. M. Krimigis. The current Principal Investigator is R. B. Decker ( robert.decker@jhuapl.edu). The CPME on IMP-8 have operated successfully for 28 years and have generated a wealth of high-quality data that have led to new discoveries and have resulted in hundreds of publications. Both the CPME and EPE instruments continued to perform without problems until IMP-8 operations were terminated by NASA at the end of October 2001. The CPME consists of a number of detector assemblies. A description of the CPME can be found in the published paper by Sarris et al. [J. Geophys. Res., 81, 2341, 1976]. A detailed account of various instrumental characteristics (energy passbands, flux conversion factors, data formats, etc.) can be found in the unpublished CPME handbook by Armstrong [1976]. Most of the detectors have their fields of view centered in the ecliptic plane, so that fairly comprehensive angular distributions in this plane can be obtained for several species, as indicated in column seven of the CMPE PET Table, by using the spin of the spacecraft. Orientations of the 8, 45-degree (full-angle) sectors of the CPME on IMP-8 are illustrated in CPME sector look directions. For more information, see: http://sd-www.jhuapl.edu/IMP/imp_index.html
CPME