Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..325f&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 325-328.
Astronomy and Astrophysics
Astrophysics
50
Doppler Effect, Solar Activity, Solar Spectra, Ultraviolet Spectra, Astronomical Spectroscopy, Atmospheric Turbulence, Emission Spectra, Line Spectra, Red Shift, Solar Atmosphere, Solar Limb, Solar Temperature
Scientific paper
Doppler shifts are measured for solar UV emission lines formed in the lower transition region of active regions. Doppler shifts in different regions at the same solar location, variations of Doppler shift with position of an active region on the disk, and variations of Doppler shift with time at the same solar location in the same active region were studied. Observations were made with the NRL slit spectrograph on Skylab. Excluding flare and flare-related phenomena, only redshifts are found whose magnitudes correspond to downflow velocities between about 4 and 17 km/s. Shifts are largest for lines formed between about 50,000 and 100,000 K, and are distinctly less for lines formed above 100,000 K. The shifts persist out to the limb, but not above it. There is no obvious change in redshift for lines measured at the same solar location over time intervals of about 20 minutes.
Cohen Lawrence
Doschek George A.
Feldman Uri
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