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Instrument: EPACT : Energetic Particles: Acceleration, Composition and Transport (WIND)
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Associated Platforms
WIND

Spectral/Frequency Information
Wavelength Keyword: Gamma Ray
Number Channels: 3
Spectral/Frequency Coverage/Range: 0.1 - 500 MeV

Related Data Sets
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Description
The Energetic Particle Acceleration, Composition, and Transport (EPACT)
investigation on WIND will provide a comprehensive study of energetic particle
acceleration and transport processes in solar flares, the interplanetary
medium, and planetary magnetospheres, as well as the galactic cosmic rays and
the anomalous cosmic ray component.
EPACT measurements will determine elemental and isotopic abundances for the
minor ions making up the solar wind, with energies in excess of 20keV. This
direct sampling of solar matter is a way to study events on the solar surface
and the incorporation of solar material into the solar wind. EPACT will also
provide information on shocks in the interplanetary medium, which accelerate
particles from solar-wind energies to several hundred keV.
The EPACT instrument consists of three integrated telescope/electronics boxes
mounted on the body of the spacecraft. The extensive dynamic range of particles
to be measured is divided between three Low Energy Matrix Telescopes (LEMT),
two Alpha-Proton-Electron Telescopes (APE), an Isotope Telescope (IT), and a
Supra Thermal Energetic Particle Telescope (STEP). The APE and IT instruments
are contained in a single package known as the Electron Isotope Telescope
(ELITE). These solid state detector telescopes all use the dE/dx by E method of
particle identification, except STEP, which obtains particle mass by measuring
time-of flight and energy. An onboard recorder allows continuous observations
to be made.
For more information, see:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/lecr/EPACT/epact.html

Online Resources
http://lheawww.gsfc.nasa.gov/docs/gamcosray/lecr/EPACT/epact.html

Instrument Logistics
Instrument Start Date: 1994-11-01
Instrument Owner: NASA