Evidence for continuum absorption above the quiet sun transition region

Astronomy and Astrophysics – Astronomy

Scientific paper

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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.

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