Instrument for Spectra, Composition and Anisotropy at Low
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 (Ei > 50 keV) and electrons
(Ee > 30 keV) are identified uniquely and detected by
five separate solid-state detector telescopes that are oriented
to give nearly complete pitch-angle coverage (i.e., coverage
of essentially 4 pi ster) from the spinning spacecraft.
Ion elemental abundances are determined by a delta E vs
E telescope using a thin (5 micron) front solid state detector
element in a three-element telescope. Experiment 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
analyser (channels spaced logarithmically) for more detailed
spectra. The instrument weighs 5.775 kg and uses 4.0 W of
power. Some initial in-ecliptic measurements are presented
which demonstrate the features of the instrument.
from: L. Lanzerotti et al., Astron. Astrophys. Suppl. Ser.
92, 349-363, 1992)
(Heliosphere Instrument for Spectra, Composition, and Anisotropy
and Low Energies) energetic particle experiment at JHU/APL
energetic particle experiment at Kansas Univ.
to Description of Instruments