Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14...45k&link_type=abstract
Advances in Space Research, vol. 14, no. 4, p. (4)45-(4)48
Astronomy and Astrophysics
Astronomy
4
Coronal Holes, Line Spectra, Solar Corona, Solar Eclipses, Solar Rotation, Doppler Effect, Fabry-Perot Interferometers, Flow Velocity, Satellite Observation, Solar Physics, Spaceborne Astronomy, Spectrum Analysis, Turbulent Flow
Scientific paper
Eclipse data on the large-scale velocity field of the green coronal line obtained by a Fabry-Perot interferometer combined with a blocking interference filter are presented. Eclipse interferograms of the solar corona of 1972 and 1981 indicate that coronal conditions are relatively quiet but not homogeneous. Doppler shifts of 95% profiles do not exceed 20 km/s. Large scale motions with velocities of 10 km/s are found for coronal regions. Effect of coronal rotation is evidently noted. Mean values of half width are different for different coronal structures. In terms of 'turbulent' velocities V(t) equals 19.5, 22.5 and 27.5 in streamers, helmets and coronal holes respectively. A tendency for the decreasing of half width with distance in one helmet, possible increasing in holes and no evident dependence are found.
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