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We have performed the first polarimetry of solar flare emission at gamma-rayenergies (0.2-1 MeV). These observations were performed with the Reuven RamatyHigh Energy Solar Spectroscopic Imager (RHESSI) for two large flares: the GOESX4.8-class solar flare of 2002 July 23, and the X17-class flare of 2003 October28. We have marginal polarization detections in both flares, at levels of 21%+/- 9% and -11% +/- 5% respectively. These measurements significantly constrainthe levels and directions of solar flare gamma-ray polarization, and begin toprobe the underlying electron distributions.Comment: 33 pages, 12 figures, accepted for publication in Ap

Gamma‐Ray Polarimetry of Two X‐Class Solar Flares