SKYLAB observations of the AL I autoionization lines gamma 1932 and gamma 1936 during a solar flare

Details SKYLAB observations of the AL I autoionization lines gamma 1932 and gamma 1936 during a solar flare SKYLAB observations of the AL I autoionization lines gamma 1932 and gamma 1936 during a solar flare

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..378c&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 378-383.

Astronomy and Astrophysics

Astrophysics

12

Line Spectra, Skylab Program, Solar Flares, Solar Spectra, Ultraviolet Spectra, Aluminum, Autoionization, H Alpha Line, Iron, Solar Atmosphere, Solar Heating, Solar Temperature, Spectral Energy Distribution, Spectrographs, Spectrum Analysis, Thermodynamic Equilibrium

Scientific paper

Observations are presented of the Al I autoionization lines gamma 1932 and gamma 1936 during the H alpha class SN subflare of 1973 August 9, obtained from the NRL slit spectrograph aboard Skylab. These profiles are compared with observations from an active-region plage and with the quiet-sun observations of McAllister. Line profiles through model flare and quiet-sun atmospheres are computed assuming local thermodynamic equilibrium. The Al I autoionization lines are sensitive to the conditions just below the temperature-minimum region of the model atmosphere, and the observations support evidence that increased heating of this region occurs during flares. It shown, using observations from three additional flares, that excess flare heating down to the Tmin region probably occurs only near loop footpoints. The behavior of Fe and Fe II lines in the 1920 A range is also discussed.

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