✦ LIBER ✦

Polarization of hard X-rays from solar flares

✍ Scribed by Eberhard Haug

Publisher: Springer
Year: 1972
Tongue: English
Weight: 453 KB
Volume: 25
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00192340

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✦ Synopsis

The polarization of hard solar X-radiation (> l0 keV) is calculated on the assumption that electrons get a non-isotropic velocity distribution in the initial phase of a flare. The bremsstrahlung generated by nonthermal electrons spiralling around magnetic field lines with discrete pitch angles is considerably polarized if observed at approximately right angles to the magnetic field. In the energy range from 10 to 50 keV the degree of polarization is not strongly dependent on the photon energy. For pitch-angle distributions of the form sin~a and cos2a, the polarization has opposite signs; it decreases appreciably at high photon energies. The observation of X-ray polarization will be useful in deducing the physical conditions in flares.

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