Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..342d&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 3, Oct. 1979, p. 342-348. Research supported by the Science Research Council and NASA.
Astronomy and Astrophysics
Astrophysics
15
Far Ultraviolet Radiation, Skylab Program, Solar Activity, Solar Spectra, Ultraviolet Spectra, Astronomical Spectroscopy, Data Reduction, Electron Density Profiles, Plasma Density, Solar Limb, Spectral Energy Distribution, Spectrographs, Spectrum Analysis, Surges
Scientific paper
The EUV spectra of a surge observed at plus 8 in. and plus 20 in. above the white light limb from Skylab are examined. The shape of the differential emission measure determined at 8 in. and 20 in. is nearly the same as for a quiet Sun spectrum at 8 in., but the emission measure of the surge at 8 in. is about an order of magnitude greater than for the quiet Sun. At 20 in. the emission measure of the surge is initially close to the quiet Sun distribution, but decreases by a factor of 4 within 6 min. The optically thin lines formed near 10 to the 5th power K show nonthermal broadening at 8 in., and electron densities near this temperature are derived from intersystem to resonance ratios. The volume of the emitting plasma at 8 in. above the limb was determined, concluding that a continuous energy input is required to explain the observations.
Doschek George A.
Feldman Uri
Mason Harris E.
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