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Energetic Particles and Ion Composition (EPIC)

NSSDC ID: 1992-044A-03
Mission Name: Geotail
Principal Investigator: Dr. Richard W. McEntire

Description

The principal objective of the EPIC (energetic particle and ion composition) investigation 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 (LEMS -- low energy composition system) and velocity/composition detectors (ICS - ion composition system), measuring ions and electrons with energies >20 keV, and ions with energy >8 keV/nucleon, 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 <1 s are possible.

Alternate Names

  • EPIC

Facts in Brief

Mass: 21.9 kg
Power (avg): 14.6 W
Bit rate (avg): 2.56 bps

Funding Agency

  • National Aeronautics and Space Administration (United States)

Discipline

  • Space Physics: Magnetospheric Studies

Additional Information

Questions or comments about this experiment can be directed to: Dr. Ramona L. Kessel.

 

Personnel

NameRoleOriginal AffiliationE-mail
Prof. George GloecklerCo-InvestigatorUniversity of Kansasgg10@umail.umd.edu
Dr. Robert E. GoldCo-InvestigatorApplied Physics Laboratoryrobert.gold@jhuapl.edu
Dr. Ching I. MengCo-InvestigatorApplied Physics Laboratorysuther@jhuapl.jhu.edu
Dr. Thomas P. ArmstrongCo-InvestigatorUniversity of Kansasarmstrong@ftecs.com
Prof. Emmanuel T. SarrisCo-InvestigatorUniversity of Thracesarris@xanthi.cc.duth.gr
Dr. Edward C. RoelofCo-InvestigatorApplied Physics Laboratoryedmond.roelof@jhuapl.edu
Dr. Stamatios M. KrimigisCo-InvestigatorApplied Physics Laboratorytom.krimigis@jhuapl.edu
Dr. Richard W. McEntirePrincipal InvestigatorApplied Physics Laboratoryrichard.mcentire@jhuapl.edu
Dr. Fred M. IpavichCo-InvestigatorUniversity of Marylandfred@soho.umd.edu
Dr. Anthony T.Y. LuiCo-InvestigatorApplied Physics Laboratoryanthony.lui@jhuapl.edu
Dr. Fritz O. GliemCo-InvestigatorTechnische Universitat Braunschweig 
Dr. Louis J. LanzerottiCo-InvestigatorAT&T Bell Laboratorieslouis.j.lanzerotti@njit.edu

Selected References

Williams, D. J., et al., Energetic particle and ion composition instrument (EPIC), In--Geotail Prelaunch Report, SES-TD-92-007SY, Institute of Space and Astronautical Science, SES Data Center, pp. 157-178, Apr. 1992.

Nishida, A., et al., Geotail mission to explore earth's magnetotail, EOS, 73, No. 40, Oct. 1992.

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