Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..270f&link_type=abstract
Astrophysical Journal, vol. 209, Oct. 1, 1976, pt. 1, p. 270-281. NASA-supported research.
Astronomy and Astrophysics
Astronomy
53
Astronomical Spectroscopy, Chromosphere, Solar Granulation, Solar Spectra, Spaceborne Astronomy, Ultraviolet Spectra, Electron Density (Concentration), Electron Energy, Line Spectra, Skylab Program, Solar Activity, Solar Limb, Spectral Line Width
Scientific paper
The paper analyzes spectra of a supergranulation cell interior and cell boundary obtained near the solar center at wavelengths between 1200 and 1560 A with a normal-incidence spectrograph aboard Skylab. Absolute intensities, relative intensities, and profiles are given for selected optically thin and optically thick lines over the cell interior, the boundary, and intermediate positions; the results are compared with spectra obtained at the limb. Characteristic lengths along the line of sight are derived for the Si III emitting region, and these are compared with the predictions of Gabriel's (1975) model. It is concluded that the present data are representative of a fairly typical cell interior and boundary, that nonthermal motions are isotropic and the same for the interior and boundary, and that the electron-density ratio between the interior and the boundary is about a factor of two or less.
Doschek George A.
Feldman Uri
Patterson N. P.
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