A Statistical Study of Limb Flares Observed by RHESSI: Relative Spectra of loop top and footpoint sources

Details A Statistical Study of Limb Flares Observed by RHESSI: Relative Spectra of loop top and footpoint sources A Statistical Study of Limb Flares Observed by RHESSI: Relative Spectra of loop top and footpoint sources

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1803j&link_type=abstract

American Astronomical Society, SPD meeting #34, #18.03; Bulletin of the American Astronomical Society, Vol. 35, p.840

Astronomy and Astrophysics

Astronomy

Scientific paper

Hard X-ray observations of YOHKOH/HXT and preliminary data form RHESSI have shown that the spectra and intensities from loop top sources are different from those at footpoints. These differences provide a great insight into the mechanism of the electron acceleration process and physical conditions of the flare loop. We have begun the investigation of a sample of limb flares observed by RHESSI. Using the imaging analysis described in the accompanying paper, we select flares with well-defined loop top and footpoint sources and calculate their relative intensities and spectra. The results from these and previous observations will be compared with the predictions of the stochastic acceleration model with the aim of constraining acceleration and its model parameters.
The work at Stanford is supported by NASA grants NAG5-12111, NAG5 11918-1, and SUB2001-402-01 through the University of Alabama in Huntsville (PI: J. Miller). J. McTiernan would like to acknowledge support from grant NAS5-98033-05/03.

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