Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...77..329r&link_type=abstract
Solar Physics, vol. 77, Apr. 1982, p. 329-340.
Physics
37
Carbon, Line Spectra, Red Shift, Silicon, Solar Spectra, Chromosphere, Extreme Ultraviolet Radiation, Oso-8, Solar Limb, Ultraviolet Spectrometers
Scientific paper
Line profiles of C IV and Si V obtained by the Colorado spectrometer on OSO-8 are presented. It is shown that the mean profiles are redshifted with a magnitude varying from 6-20 km/s, and with a mean of 12 km/s. An apparent average downflow of material in the 50,000-100,000 K temperature range is measured. The redshifts are observed in the line center positions of spatially and temporally averaged profiles and are measured either relative to chromospheric Si I lines or from a comparison of sun center and limb profiles. The observations of 6-20 km/s redshifts place constraints on the mechanisms that dominate EUV line emission since it requires a strong weighting of the emission in regions of downward moving material, and since there is little evidence for corresponding upward moving materials in these lines.
Roussel-Dupre Diane
Shine Richard A.
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