Wavelength-dependence of EUV continuum absorption

Details Wavelength-dependence of EUV continuum absorption Wavelength-dependence of EUV continuum absorption

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93...37n&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 93, June 1984, p. 37-51.

Physics

3

Continuous Spectra, Extreme Ultraviolet Radiation, Lyman Spectra, Solar Atmosphere, Solar Spectra, Ultraviolet Absorption, Ultraviolet Spectra, Chromosphere, Neutral Gases, Optical Thickness, Radiant Flux Density, Solar Temperature, Spectral Energy Distribution, Wavelengths

Scientific paper

The weakening of EUV line emission due to continuum absorptions of neutral hydrogen and neutral helium is investigated to examine its wavelength-dependence. After convolving the intensities predicted from multilevel calculations over an instrumental profile, the author found a systematic, linear weakening for lines shortward of 912 Å, which can be attributed to Lyman continuum absorption in the cool chromospheric cloud. The degree of the weakening at the quiet Sun seems to be constant in the temperature range of 4.3 < logT < 5.4. The author also finds that the lines shortward of 504 Å are somewhat weakened by He I continuum absorption. From the comparison of both weakenings the temperature of the absorber is estimated to be rather low (Te ⪉ 7×103K).

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