Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rspta.281..305b&link_type=abstract
(Royal Society, Discussion on the Physics of the Solar Atmosphere, London, England, Jan. 14, 15, 1975.) Royal Society (London),
Physics
1
Brightness Temperature, Continuous Spectra, Far Ultraviolet Radiation, Luminous Intensity, Solar Spectra, Ultraviolet Spectra, Astronomical Models, Atmospheric Models, Opacity, Radial Distribution, Temperature Distribution
Scientific paper
The most recent measurements of the solar EUV continuum are reviewed and compared with results of computations. The observations include measurements of the solar brightness temperature and center-limb intensity measurements. Comparisons are made with the BCA and HSRA model atmospheres, and departures from LTE in the EUV continuum are noted. The problem of 'missing opacity' is considered from the standpoints of line blanketing and analyses of EUV spectra of other stars. Inhomogeneities in the solar EUV continuum are discussed along with the presence of cold structures in some areas of the disk. It is concluded that: (1) the minimum brightness temperature reaches a minimum value of 4400 K, (2) the EUV brightness temperature does not represent the kinetic temperature due to large departures from LTE of the main absorber and Si I in particular, and (3) a large portion of the 'missing opacity' can be accounted for by line blanketing.
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