Solar abundances from X-ray flare observations

Details Solar abundances from X-ray flare observations Solar abundances from X-ray flare observations

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197...41v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 41-55.

Astronomy and Astrophysics

Astronomy

68

Abundance, Solar Corona, Solar Flares, Solar X-Rays, X Ray Astronomy, Argon, Calcium, Light Curve, Resonance Lines, Silicon, X Ray Spectra

Scientific paper

X-ray line and continuum observations are used to derive the absolute coronal abundances of Si, S, Ar, and Ca from lines of hydrogenor helium-like ions. For Si (7.7+0.2, -0.3) and Ca (6.5+0.1, -0.3) the measured coronal values are in good agreement with the photospheric values, but the value for S (6.9+0.1, -0.3) is approximately half of the photospheric value. The abundance of Ar (6.4+0.2, -0.3) also appears to be lower in the corona by a factor of 2-3 than would be expected. It is suggested that these differences are due to ambipolar and magnetic diffusion effects.

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