Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.5407b&link_type=abstract
American Astronomical Society Meeting 204, #54.07; Bulletin of the American Astronomical Society, Vol. 36, p.758
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present RHESSI hard X-ray imaging, spectroscopy, and source motion analysis of a long-duration GOES M 4.5 class flare (18 Nov 2003 0923-1101 UT), whose footpoints were occulted by the east limb of the Sun. During the rise phase of the flare a non-thermal hard X-ray source is seen above 20 keV with a spectral power-law index around 6. The source is initially detected 50 arcseconds above the limb and seen to rise with a velocity of 12 km/s. Its time profile varies on a scale of tens of seconds. At lower energies, a thermal hard X-ray source with a temperature of up to 17 MK is detected 10 arcseconds below the non-thermal source, and seen to be rising with a lower velocity of 7 km/s. Its time variation is slow and gradual, similar to that of the GOES time profile. Both sources are seen above GOES SXI soft X-ray and SOHO EIT EUV loops. We also discuss the energetics of the non-thermal above-the-loop-top source.
Balciunaite P.
Krucker Sa"m
Lin Robert P.
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