The RHESSI Spectrometer |
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| Authors: | Smith DM Lin RP Turin P Curtis DW Primbsch JH Campbell RD Abiad R Schroeder P Cork CP Hull EL Landis DA Madden NW Malone D Pehl RH Raudorf T Sangsingkeow P Boyle R Banks IS Shirey K Schwartz Richard |
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| Institution: | (1) Space Sciences Laboratory, University of California, Berkeley, U.S.A;(2) Lawrence Berkeley National Laboratory, U.S.A;(3) ORTEC, U.S.A;(4) NASA Goddard Space Flight Center, U.S.A;(5) NASA Goddard Space Flight Center/SSAI, U.S.A |
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| Abstract: | RHESSI observes solar photons over three orders of magnitude in energy (3 keV to 17 MeV) with a single instrument: a set of
nine cryogenically cooled coaxial germanium detectors. With their extremely high energy resolution, RHESSI can resolve the
line shape of every known solar gamma-ray line except the neutron capture line at 2.223 MeV. High resolution also allows clean
separation of thermal and non-thermal hard X-rays and the accurate measurement of even extremely steep power-law spectra.
Detector segmentation, fast signal processing, and two sets of movable attenuators allow RHESSI to make high-quality spectra
and images of flares across seven orders of magnitude in intensity. Here we describe the configuration and operation of the
RHESSI spectrometer, show early results on in-flight performance, and discuss the principles of spectroscopic data analysis
used by the RHESSI software. |
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