RHESSI soft X-ray imaging spectroscopy of a flare
Abstract
We apply RHESSI imaging spectroscopy to a well-observed solar flare on 26~April~2003. This GOES M2-class flare (N20W69) exercised all three of the RHESSI shutter states, and was simultaneously observed by the RESIK high-resolution X-ray spectrometer on board the CORONAS-F spacecraft (Dennis et al., 2005). It thus provides an excellent opportunity to study the behavior of the high-throughput RHESSI observations of the Fe~emission-line complex at ~6.7~keV. The equivalent width of this feature has a unique dependence on the assumed isothermal temperature of the source (Phillips, 2004). Comparing this feature-derived temperature between the onset and decay phases of the event, we note a discrepancy between it and the temperature derived directly from the continuum. We analyze the causes of this discrepancy in terms of image morphology, non-isothermality, non-equilibrium excitation, and instrument properties.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2005
- Bibcode:
- 2005AGUSMSH31A..03H
- Keywords:
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- 7519 Flares;
- 7554 X rays;
- gamma rays;
- and neutrinos;
- 7594 Instruments and techniques