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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[18.14] RHESSI Hard X-ray observations of the March 18, 2003 X-class Flare

M. D. Fivian, S. Krucker, R. P. Lin (Space Sciences Lab, UC Berkeley)

Hard X-ray observations of the GOES X1.5 flare on March 18, 2003, taken by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) are presented. This long duration event (GOES duration slightly longer than 1 hour) occurred at S15W46. Enhanced hard X-ray emission (>30 keV) is seen for more than 25 minutes with the strongest HXR bursts detected almost 10 minutes after the peak emission seen in GOES soft X-ray. Signatures of escaping energetic electrons, such as radio type III bursts seen with WIND/WAVES in the interplanetary space and a large electron event detected by WIND/3DP at 1 AU, are only observed with the later HXR burst but not during the rise phase of the SXR. In order to understand this, the HXR sources and their motions are investigated and compared to TRACE (171 /AA) EUV images and MDI magnetograms.

This work is funded by NASA grant NAS5-98033-05/03.

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