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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[18.07] A Multi-wavelength Analysis of a Solar Limb Flare on 2002 April 15

L. Sui (CUA/GSFC), G. D. Holman (GSFC), D. E. Gary (NJIT), K. Shibasaki (NORH)

A detailed analysis of a limb flare on 2002 April 15 was carried out using RHESSI X-ray images and spectra, Nobeyama microwave images, Owens Valley Solar Array (OVSA) microwave spectra, and SOHO EIT & LASCO images. This M1.2 flare lasted about 40 minutes in GOES soft X-rays. RHESSI missed part of the decay phase of the flare. RHESSI images show a thermal flare loop at 6-25 keV and a bright thermal looptop source within the loop throughout the flare. At the peak of the flare, a coronal source 6 arcseconds above the flare loop and two clear-cut footpoints appear at 25-50 keV. Another coronal source above the loop at 10-25 keV ejected outward at about 600 km/s after the peak. By fitting the RHESSI spectra, we found that a low-energy cut-off at about 22 keV is required in order to get a consistent evolution of the thermal plasma parameters with time. After the hard X-ray peak, the flare loop moves outward in both the SOHO/EIT 195 Åband and the Nobeyama microwave images. It precedes an expanding coronal anomaly observed in SOHO/LASCO C2 images. We will show images and movies of our results, and a comparison of the microwave images and spectra with the RHESSI observations.

This project was supported in part by the RHESSI Project and the NASA Sun-Earth Connection Program.

The author(s) of this abstract have provided an email address for comments about the abstract: lhsui@stars.gsfc.nasa.gov

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