Heliosphere Instrument for Spectra, Composition and Anisotropy at Low Energies

Details Heliosphere Instrument for Spectra, Composition and Anisotropy at Low Energies Heliosphere Instrument for Spectra, Composition and Anisotropy at Low Energies

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...92..349l&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 92, no. 2, Jan. 1992, p. 349-363. Research supported by NASA

Astronomy and Astrophysics

Astrophysics

112

Interplanetary Medium, Plasma Composition, Satellite-Borne Instruments, Ulysses Mission, Weak Energy Interactions, Anisotropy, Electron Energy, Electron Spectroscopy, Ion Temperature

Scientific paper

The Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energies (HI-SCALE) is designed to make measurements of interplanetary ions and electrons throughout the entire Ulysses mission. The ions (E(i) greater than about 50 keV) and electrons (E(e) greater than about 30 keV) are identified uniquely and detected by five separate solid-state detector telescopes that are oriented to give nearly complete pitch-angle coverage from the spinning spacecraft. Ion elemental abundances are determined by Delta E vs E telescope using a thin (5 microns) front solid state detector element in a three-element telescope. Experimental operation is controlled by a microprocessor-based data system. Inflight calibration is provided by radioactive sources mounted on telescope covers which can be closed for calibration purposes and for radiation protection during the course of the mission. Ion and electron spectral information is determined using both broad-energy-range rate channels and a 32 channel pulse-height analyzer for more detailed spectra. Some initial in-ecliptic measurements are presented which demonstrate the features of the instrument.

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