Weakening of the solar extreme-ultraviolet line emission by lyman continuum absorption as derived from line ratios

descriptionPublicationkeyboard_double_arrow_right Article 01 Mar 1984 English Publisher:Springer Science and Business Media LLCJournal:Solar Physics, volume 91 (issn: 0038-0938, eissn: 1573-093X,

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Authors: Mitsuo Kanno; Yoshinori Suematsu; Takara Nishikawa;

doi: 10.1007/bf00213613

Weakening of the solar extreme-ultraviolet line emission by lyman continuum absorption as derived from line ratios

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Abstract

The intensity ratios of Niii, Oiii, Oiv, and Ov lines observed by the HCO experiment on Skylab are compared with the results of recent multilevel calculations. It is found that solar transition-region spectra require Lyman continuum absorption. The equivalent optical thickness of the absorbers causing the weakening is found to be 1.6–1.7 for a quiet area, 1.4–1.9 for a coronal hole, and 2.4–2.5 for active regions. These values are consistent with previous estimates from different methods.

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