Element abundances from solar flare spectra

Details Element abundances from solar flare spectra Element abundances from solar flare spectra

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217..317d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 15, 1985, p. 317-326. Navy-supported research

Astronomy and Astrophysics

Astronomy

42

Abundance, Solar Flares, Solar Spectra, X Ray Spectra, Argon, Calcium, Iron, Potassium, Ratios, Solar Atmosphere, Solar Corona

Scientific paper

Ratios of solar element abundances are determined for Ar/Ca, K/Ca, and Ca/Fe, from high-resolution solar flare X-ray spectra obtained from Bragg spectrometers flown on the P78-1 spacecraft. Values of the ratios are: Ar/Ca = 0.65, K/Ca = 0.10, and Ca/Fe = 0.10. If the abundance of iron is taken to be coronal, i.e. log A(Fe) = 7.65 log A(H) = 12, then the abundances are: log A(Ca) = 6.62, log A(Ar) = 6.44, log A(K) = 5.62. If the iron abundance is assumed to be photospheric, i.e., log A(Fe) = 7.50, then the abundances are: log A(Ca) = 6.47, log A(Ar) = 6.29, log A(K) = 5.47. The uncertainties in abundance ratios are + or - 25 percent. The abundance results are discussed in terms of the possibility of varying abundances in the solar atmosphere.

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