Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l.151d&link_type=abstract
Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 2, p. L151-L154. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
17
Chromosphere, Far Ultraviolet Radiation, Solar Atmosphere, Solar Corona, Solar Spectra, Astronomical Models, Polar Regions, Skylab Program, Solar Activity, Solar Limb
Scientific paper
Solar limb-brightening curves are discussed for XUV spectral lines formed in the upper chromosphere and transition zone of a quiet region and a polar coronal hole. The spectra were recorded with a slit spectrograph on Skylab. The lines considered are emitted from ions formed within the temperature range from 10,000 to 220,000 K. The limb-brightening curves cover a region from -4 sec within the limb to +20 sec above it. The data from 0 sec to +20 sec are compared with predictions based on both homogeneous and inhomogeneous models of the transition zone. The limb-brightening curve of the O I line at 1355.6 A indicates that O I is formed in spicules. The limb brightening of the He II line at 1640.4 A is consistent with a temperature of formation between about 40,000 and 90,000 K for He II.
Doschek George A.
Feldman Uri
Tousey Richard
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