Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..789r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 263, NO. 3/AUG1, P. 789, 1993
Astronomy and Astrophysics
Astronomy
12
Line: Profiles - Sun: Corona - Sun: Magnetic Fields
Scientific paper
Line-of-sight velocities in the inner solar corona are calculated from the coronal green-line profiles obtained from Fabry-Perot interferometric observations of the solar corona during the total solar eclipses of 1980 and 1983. The main features of the line-of-sight velocities seen in the Fabry-Perot fringes are reported here. Line profiles obtained from the 1980 observations show strong signatures of multiple components. The line profiles, in general, are found to contain one main component and a few subsidiary components. A large excess of components on the blue side of the main component is found. Line profiles belonging to the coronal active regions often show line splitting. The derived velocities associated with the 1980 coronal line profiles in general show an outward increase with respect to the innermost regions. This increase is found to be dependent on the coronal position angle and hence related to the activity of the underlying coronal region. The dispersion in velocities is found to be smaller in the closed magnetic field regions than that in the open regions, indicative of a more ordered flow in the former regions. The majority of the line profiles obtained from the 1983 observations show single components. The derived velocities associated with the fringes are small in comparison to 1980 values. The trend of increasing velocity with increasing coronal height is seen only in one case out of three. The line-of-sight velocities in the line profiles are interpreted as due to the discrete moving plasma components in the line of sight, which arise as a result of the motion of plasma inside the coronal loops. It is suggested that coronal loop motions were stronger in 1980 than in 1983.
Ashok Nagarhalli M.
Chandrasekhar T.
Desai J. N.
Raju K. P.
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