Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..301w&link_type=abstract
Solar Physics, vol. 45, Dec. 1975, p. 301-317.
Physics
88
Far Ultraviolet Radiation, Solar Corona, Solar Spectra, Solar Temperature, Ultraviolet Spectra, Abundance, Line Spectra, Oso
Scientific paper
A technique for analyzing measurements of XUV spectral-line intensities is described. Application of the technique to OSO-4 and OSO-6 spectra indicates that the mean coronal temperature is 2.1 million K in typical active solar regions and that the mean coronal temperature in typical quiet regions ranges from 1.5 to 2.1 million K. One active-region spectrum shows evidence for substantial quantities of coronal material with temperatures between 2 and 3.5 million K. Measurements from limb spectra show evidence that (1) coronal abundances of N and O are low relative to heavier elements; or (2) that the ionization-equilibrium calculations used may contain systematic errors; or (3) that the XUV intensity measurements may be incorrectly calibrated.
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