Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..929m&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 929-939.
Astronomy and Astrophysics
Astrophysics
24
Skylab Program, Solar Limb, Solar Prominences, Solar Spectra, Ultraviolet Spectra, Electron Density (Concentration), Electron Energy, Helium, Line Spectra
Scientific paper
Line profiles of extreme ultraviolet emission lines observed in a solar prominence at positions above the white-light limb with the NRL slit spectrograph on Skylab are discussed. Absolute line intensities and full widths at half-maximum are presented, and emission measures, electron densities, and mass motions are derived at several locations within the prominence. For electron temperatures less than 40,000 K, the calculated mass motions are found to be near zero, while for electron temperatures greater than 40,000 K, the nonthermal velocity decreases with increasing height in the prominence. It is suggested that falling material is responsible for the fact that the measured electron density decreases with height less rapidly than the decrease predicted for a hydrostatic gas. In addition, from the He II 1640 A line profile, an average temperature of 27,000 K is derived for the region in which He II is emitted.
Doschek George A.
Feldman Uri
Mariska John T.
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