34th Solar Physics Division Meeting, June 2003
Session 18 RHESSI Results II
Poster, Wednesday, June 18, 2003, 3:30-5:00pm, Mezzanine

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[18.10] RHESSI Observations of Two Occulted Solar Flares

P. Balciunaite, S. Krucker (Space Sciences Lab, UCB), S. Christe, R. P. Lin (Space Sciences Lab, UCB; Department of Physics, UCB)

We present RHESSI (Reuven Ramaty Solar Spectroscopic Imager) observations of two limb-occulted solar flares (GOES C2 and C5 class), which occurred on 13 May 2002 10:50-22:20 UT and 14 October 2002 14:00 UT-15 October 2002 16:00 UT, respectively. The observations of such flares allow the investigation of coronal hard X-ray sources without the interference of the generally brighter footpoint sources. The aforementioned events are inferred to originate 34 and 44 degrees behind the east limb by tracking the most probable originating active regions (NOAA 9957 and 0162, respectively). The 8-15 keV source centroid position as a function of time initially shows a constant position just above the solar limb for approximately 2 hours. Then the source appears to rise above the limb, in a manner that could not be due solely to solar rotation. Presently we are investigating spectra for both events to derive the temperature and emission measures and search for a possible non-thermal contribution.


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