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Medium Energy Particle Analyzer (MEPA)

NSSDCA ID: 1984-088A-02

Mission Name: AMPTE/CCE
Principal Investigator:Dr. Richard W. McEntire


The instrument consisted of a collimator and an electron sweeping magnet followed by a 10-cm time-of-flight (TOF) telescope with thin foils at the front and midpoint and a solid-state detector at the rear. Incident ion TOF was measured from the front foil to the back detector and from the center foil to the back detector, and energy was measured in the back detector. The dual TOF measurement and very fast energy channel processing gave high immunity to accidental events, and allowed the instrument to measure the composition and spectra of both common species and tracer ions over a species-dependent energy range of >10 keV/nucleon to 6 MeV/nucleon, with a geometric factor of 1.E-2 sq cm-sr and 32-sector angular resolution. For more details, see R. W. McEntire et al., IEEE Transactions on Geoscience and Remote Sensing, v. GE-23, p. 230, 1985.

Alternate Names

  • MEPA

Funding Agency

  • NASA-Office of Space Science (United States)


  • Space Physics: Magnetospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Richard W. McEntireLead InvestigatorApplied Physics
Dr. Stamatios M. KrimigisOther InvestigatorApplied Physics
Dr. Edwin P. KeathOther InvestigatorApplied Physics Laboratory
Dr. Anthony T.Y. LuiOther InvestigatorApplied Physics
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