34th Solar Physics Division Meeting, June 2003
Session 22 RHESSI Results III
Oral, Thursday, June 19, 2003, 9:00-10:30am, Auditorium

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[22.08] RHESSI Hard X-Ray Imaging Spectroscopy of the July 23, 2002 Solar Flare

A.G. Emslie (UAH), E.P. Kontar (University of Glasgow), S. Krucker, R.P. Lin (UC Berkeley)

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.

If you would like more information about this abstract, please follow the link to http://www.astro.gla.ac.uk/users/eduard/rhessi/july23/papers/emslie_et_al.pdf. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: emslieg@uah.edu

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.