Physics – Optics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991japa...12..311r&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 12, no. 4, Dec. 1991, p. 311-317. Research supported by Department
Physics
Optics
4
Line Spectra, Solar Corona, Solar Eclipses, Visible Spectrum, Wave Excitation, Astronomical Photography, Cassegrain Optics, Solar Electrons
Scientific paper
The line intensity of the green coronal line and the continuum intensity are derived from the filter and white light photographs of the solar corona obtained during the 1980 total solar eclipse. Ratio of the line to continuum intensity is plotted against the radial distance r(= R/R0, R0 is the solar radius), in various position angles. A simple model assuming an electron density dependence of the line and continuum intensities suggests a dominant collisional mechanism for the excitation of the line in the innermost regions (about 1.4 R0). The measured line to continuum ratio tends to a constant value at different radial distances in different position angles. The constancy of the measured line to continuum ratio indicates significant radiative excitation beyond 1.4 R0, in some of the position angles.
Ashok Nagarhalli M.
Chandrasekhar T.
Desai J. N.
Raju K. P.
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