Preliminary Results from the HIgh REsolution Gamma-ray and hard x-ray Spectrometer (HIREGS) Long Duration Balloon Flight in Antarctica

Details Preliminary Results from the HIgh REsolution Gamma-ray and hard x-ray Spectrometer (HIREGS) Long Duration Balloon Flight in Antarctica Preliminary Results from the HIgh REsolution Gamma-ray and hard x-ray Spectrometer (HIREGS) Long Duration Balloon Flight in Antarctica

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4508f&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #45.08; Bulletin of the American Astronomical Society, Vol. 24, p.803

Astronomy and Astrophysics

Astronomy

Scientific paper

The HIgh REsolution Gamma-ray and hard x-ray Spectrometer (HIREGS) was flown on a 14 day balloon flight from McMurdo Station, Antarctica in January 1992. For this flight, HIREGS consists of an array of four 6.7cm diameter x 6.1cm long liquid nitrogen-cooled segmented germanium detectors enclosed in a bismuth germanate (BGO) shield. A CsI front collimator defines a 24 degree FWHM field-of-view, while passive collimation reduces the field-of-view to roughly 3 x 12 degrees for hard X-rays (<200 keV). The energy resolution is one to several keV from 20 keV to 16 MeV. 178 hours of observations were obtained: Jan 10 0943UT - Jan 12 1026UT, Jan 13 0528UT - Jan 15 0823UT, Jan 17 2000UT - Jan 18 1909UT, Jan 20 0245UT - Jan 22 1522UT. Out of these 178 hours, 128 hours were spent on the sun. We have analyzed the data for two M class flares on Jan 13 1913UT and Jan 14 1937UT. No significant hard x-ray or gamma-ray emission was detected for either flare. We are currently searching for hard x-ray emission from smaller C class flares.

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