Other
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.2208e&link_type=abstract
American Astronomical Society, SPD meeting #34, #22.08; Bulletin of the American Astronomical Society, Vol. 35, p.851
Other
Scientific paper
We present hard X-ray images in different energy bands, as obtained by the unique combination of rotating modulation collimators and high-resolution germanium spectrometers on the RHESSI satellite, for the large X-class flare of July 23, 2002. These data are then used to construct spatially-resolved hard X-ray spectra for each of four prominent features evident in these images. These four main features are a bright, low-energy (soft spectrum) source high in the corona, two localized high-energy (hard spectrum) footpoints and a bright feature bounded by the other three, which could either be an additional footpoint or a source near the top of a magnetic structure connecting the other two. The temporal evolution of the spectrum of each feature is described, with allowances for the dynamic range of the RHESSI instrument, which obscures weak sources at a given photon energy when one or more much brighter sources at this photon energy are also present. A comparison with the temporal evolution of the spatially-integrated hard X-ray spectrum is also provided.
This work was supported by NASA's Office of Space Science and by a PPARC Award.
Emslie Gordon A.
Kontar Eduard P.
Krucker Sa"m
Lin Robert P.
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