Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....69...11d&link_type=abstract
Astronomy and Astrophysics, vol. 69, no. 1, Sept. 1978, p. 11-21. NASA-supported research.
Astronomy and Astrophysics
Astronomy
9
Far Ultraviolet Radiation, Mass Transfer, Skylab Program, Solar Activity, Ultraviolet Astronomy, Electron Density (Concentration), Electron Transitions, H Alpha Line, Line Spectra, Solar Spectra
Scientific paper
The profiles of spectral lines in the 1100-2000-A range emitted by transition-zone ions in regions of solar activity are discussed. The data were recorded by the NRL spectrograph on Skylab. At the spatial resolution of the Skylab spectrograph (2 x 60 arcsec), it is shown that the line profiles result from the superposed emission of a number of physically distinct regions at different electron densities and with different mass motions. Although high densities are found for some surgelike phenomena at transition-zone temperatures, the densities can also be comparable to normal active-region densities. Line profiles, as well as spectral line intensities, must be considered if meaningful theoretical models of dynamic activity in the transition zone are to be constructed.
Doschek George A.
Feldman Uri
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