Gamma‐Ray Polarimetry of Two X‐Class Solar Flares | Zendy

Steven E. Boggs | Zendy; W. Coburn | Zendy; Emrah Kalemci | Zendy

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Gamma‐Ray Polarimetry of Two X‐Class Solar Flares

Author(s) -

Steven E. Boggs,

W. Coburn,

Emrah Kalemci

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/498930

Subject(s) - physics , flare , solar flare , polarimetry , astrophysics , gamma ray , polarization (electrochemistry) , x ray , astronomy , scattering , optics , chemistry

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

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