On the nonthermal excitation and polarization of X-ray lines during solar flares

Details On the nonthermal excitation and polarization of X-ray lines during solar flares On the nonthermal excitation and polarization of X-ray lines during solar flares

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...61..129h&link_type=abstract

Solar Physics, vol. 61, Feb. 1979, p. 129-142.

Astronomy and Astrophysics

Astronomy

25

Solar Flares, Solar Spectra, Solar X-Rays, X Ray Spectra, Electron Energy, Oso-5, Satellite Observation, Spaceborne Astronomy

Scientific paper

The energy distributions of nonthermal electrons are derived from hard X-ray spectra taken during the impulsive phase of two 2B flares in February 1969. They are used to calculate the fluxes of nonthermally excited X-ray lines of hydrogen-like and helium-like ions. These fluxes are compared to the total line fluxes observed at the same time with crystal spectrometers. The nonthermal excitation is found to give only small contributions to the total line intensities. This implies that the impact polarization which is to be expected for anisotropic velocity distributions of the energetic electrons, will be low. Nevertheless it should be feasible to detect line polarization during the impulsive phase of strong X-ray flares.

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