Other
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ssrv...21..379b&link_type=abstract
(Conference on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 5th, London, England, July 4-7, 1977.) Space S
Other
5
High Resolution, Solar Atmosphere, Solar Spectra, Ultraviolet Spectroscopy, Angular Resolution, Chromosphere, Doppler Effect, Optical Thickness, Solar Activity, Solar Corona, Solar Flares, Solar Granulation, Spectral Line Width, Spectral Resolution, Sunspots
Scientific paper
Results obtained by Skylab, OSO 8, and rocket instruments are used to show the impact of high-resolution UV spectroscopy on our knowledge on the dynamics of the upper solar atmosphere. Thus, coronal expansion is shown to originate at the top of the transition region; the existence of downward flows over the bright regions of the network is evidenced from redshifts or transition region and chromospheric optically thin lines: velocities as high as 22 km/sec have been measured in the lines of O VI, while short-period waves (95 sec) have been detected in the lines of Si II at chromospheric levels. There is strong evidence that optically thin chromospheric and transition-region lines are broadened by a nonthermal velocity component which peaks at 1.3 x 10 to the fifth K and decreases at higher temperatures. This may suggest the presence of unresolved acoustic or magnetohydrodynamic waves that are frequently regarded as the source of chromospheric and coronal heating. Discrepancies between some results are attributed to different angular resolutions of the instruments. It is suggested that the Solar Optical Telescope and the Grazing Incidence Solar Telescope would supplement each other on Skylab in the 1980's.
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