RHESSI as a Monitor of the Hard X-Ray Sky

Details RHESSI as a Monitor of the Hard X-Ray Sky RHESSI as a Monitor of the Hard X-Ray Sky

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.2220m&link_type=abstract

American Astronomical Society, HEAD meeting #7, #22.20; Bulletin of the American Astronomical Society, Vol. 35, p.643

Astronomy and Astrophysics

Astronomy

Scientific paper

The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), a NASA Small Explorer (SMEX) satellite, was launched on February 5, 2002. The primary goal of RHESSI is to image the hard X-ray and gamma-ray emission from solar flares using an array of nine large high-resolution Ge detectors that cover the energy range from 3 keV up to 20 MeV. With a small (1 degree) FoV, the spacecraft always remains pointed at the Sun. However, the unshielded Ge array offers the opportunity to monitor the hard X-ray sky using Earth occultation techniques, much like what was done with the very successful BATSE experiment on CGRO. In addition, a second far more sensitive sky monitoring technique uses detector shadowing effects within the rotating Ge array. RHESSI can achieve nearly full-sky monitoring of hard X-ray sources using the Earth occultation technique, but with a sensitivity far better than that of BATSE. The monitoring of the hard X-ray sky based on the occultation of sources within the rotating Ge array provides significantly better sensitivity, but with a reduced sky coverage. We describe these techniques in detail and present estimates of the source detection sensitivity based on Monte Carlo simulations.

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