The purpose of this investigation is to study, at high spatial and temporal resolution, the energetic charged particles in the environment of Comet Halley. Observations of energetic particles and their angular distributions, taken in conjunction with onboard magnetic measurements, can determine whether the magnetic field lines in the cometary tail are open or closed. Encounter data can be used to provide the background corrections for those devices on other Giotto experiments which are sensitive to energetic particle radiation. The instrument employs both active and passive shielding of surface barrier detectors along with dE/dx vs E circuitry to measure: electrons above about 15 keV, protons above about 20 keV, and particles with Z greater... ...Show More
urn:nasa:pds:context:instrument:epa.gio
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