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

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

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91...71k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 91, March 1984, p. 71-74.

Physics

2

Extreme Ultraviolet Radiation, Lyman Spectra, Solar Spectra, Ultraviolet Absorption, Line Spectra, Optical Thickness

Scientific paper

The intensity ratios of N III, O III, O IV, and O V 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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