Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231l..41s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 231, July 1, 1979, p. L41-L44.
Astronomy and Astrophysics
Astronomy
69
Absorption Spectra, Chromosphere, Continuous Spectra, Solar Corona, Ultraviolet Astronomy, Far Ultraviolet Radiation, Lyman Spectra, Neutral Gases, Satellite Observation, Solar Spectra
Scientific paper
Evidence for continuum absorption in the solar transition zone in EUV spectra obtained from OSO 4, OSO 6, ATM, and full-sun measurements is reported. This absorption shortward of 912 A is manifested everywhere on the sun's disk. It is present within network cells and boundaries of the quiet sun, in coronal holes, in active regions, above the limb, and in solar prominences. Models of the upper chromosphere and the transition zone must be modified to include an admixture of neutral hydrogen (or possibly single ionized helium) with the hotter plasma.
Orrall Frank Q.
Schmahl Ed. J.
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