Radiative transfer of X-rays in the solar corona

Details Radiative transfer of X-rays in the solar corona Radiative transfer of X-rays in the solar corona

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225.1069a&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 1069-1075. Research supported by the Lockheed Independent Research Pr

Astronomy and Astrophysics

Astrophysics

42

Optical Thickness, Radiative Transfer, Solar Corona, Solar X-Rays, X Ray Scattering, Line Spectra, Resonance Scattering, X Ray Spectra

Scientific paper

The problem of resonance scattering of X-ray emission lines in the solar corona is investigated. For the resonance lines of some helium-like ions, significant optical depths are reached over distances small compared with the size of typical coronal features. A general integral equation for the transfer of resonance-line radiation under solar coronal conditions is derived. This expression is in a form useful for modeling the complex three-dimensional temperature and density structure of coronal active regions. The transfer equation is then cast in a form illustrating the terms which give rise to the attenuation or enhancement of the resonance-line intensity. The source function for helium-like oxygen (O VII) under coronal conditions is computed and discussed in terms of the relative importance of scattering.

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