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Instrument: EPIC : Energetic Particle and Ion Composition (Geotail)
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The principal objective of the EPIC (Energetic Particle and Ion Composition)
investigation on Geotail is to explore the distant magnetotail region and
obtain information on the origin, transport, storage, acceleration and dynamics
of suprathermal and non-thermal particle populations.

The instrument performs three-dimensional distribution measurements by using
both total energy, E/Q and time of flight (STICS -- Supra-Thermal Ion
Composition Spectrometer) and Velocity/Energy (ICS -- Ion Composition
Subsystem) detectors. These measure Ions >8 keV/charge and Ions/Electrons >35
keV, respectively.

Composition measurements are made by using a thin foil time-of-flight technique
which resolves the H and He isotopes, and provides elemental resolution up to
approximately argon. The instrument also measures the non-thermal components to
6 MeV for protons, 480 keV for electrons, and 400 keV/nucleon for ions with
Z>2. Directional measurements with a time resolution <3 s are possible.

Principal Investigator:
Richard McEntire
Applied Physics Lab, Johns Hopkins University
John Hopkins Road
Laurel, MD 20723-6099
Phone: 240-228-5410


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Instrument Logistics
Data Rate: 2.56 kbps
Instrument Start Date: 1992-07-24
Instrument Owner: Johns Hopkins University Applied Physics Lab