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Anisotropy and polarization of solar X-ray bursts

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Abstract

The effects of the Compton back-scattered X-ray flux from the photosphere on the directivity and polarization of flare X-rays between 15 keV and 150 keV are computed. The calculations are made with a thin target model for flares of De Jager-Kundu type with electrons spiralling downward around a vertical magnetic field and for an Isotropie source.

The resulting polarization for an isotropic source is not higher than 4%. The resulting directivity of anisotropic sources is greatly reduced, particularly below 70 keV.

The results of the statistical studies of the center-limb distribution of solar X-ray bursts are then compatible with the existing measures of polarization. The hypothesis for existence of De JagerKundu type flares is enforced.

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  1. Observatoire de Paris, 92190, Meudon, France

    J. C. Henoux

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  1. J. C. Henoux
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Henoux, J.C. Anisotropy and polarization of solar X-ray bursts. Sol Phys 42, 219–233 (1975). https://doi.org/10.1007/BF00153298

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  • DOI: https://doi.org/10.1007/BF00153298

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