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The interpretation of hard X-ray polarization measurements in solar flares
Authors:John Leach  A Gordon Emslie  Vahé Petrosian
Institution:(1) Center for Space Science and Astrophysics, Stanford University, USA;(2) Department of Applied Physics, Stanford University, USA;(3) Department of Physics, University of Alabama in Huntsville, USA;(4) Center for Space Science and Astrophysics, Stanford University, USA;(5) Department of Applied Physics, Stanford University, USA
Abstract:We review recent observations of polarization of moderately hard X-rays in solar flares and compare them with the predictions of recent detailed modeling of hard X-ray bremsstrahlung production by non-thermal electrons. We find that the recent advances in the complexity of the modeling lead to substantially lower predicted polarizations than in earlier models and more fully highlight how various parameters play a role in determining the polarization of the radiation field. The new predicted polarizations are comparable to those predicted by thermal modeling of solar flare hard X-ray production, and both are in agreement with the observations. In the light of these results, we propose new polarization observations with current generation instruments which could be used to discriminate between non-thermal and thermal models of hard X-ray production in solar flares.
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