Fabry-Perot line profiles in the 5303 A and 6374 A coronal lines obtained during the 1983 Indonesian eclipse

Details Fabry-Perot line profiles in the 5303 A and 6374 A coronal lines obtained during the 1983 Indonesian eclipse Fabry-Perot line profiles in the 5303 A and 6374 A coronal lines obtained during the 1983 Indonesian eclipse

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..131...25c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 131, Jan. 1991, p. 25-39. Research supported by Department of Space of India, National Geog

Physics

15

Fabry-Perot Interferometers, Line Spectra, Solar Corona, Solar Eclipses, Solar Spectra, Line Of Sight, Microdensitometers, Signal To Noise Ratios, Solar Temperature, Velocity Distribution

Scientific paper

During the total solar eclipse of 11 June, 1983, an imaging dual-channel Fabry-Pérot interferometer was used to obtain line proffles simultaneously in the green λ5303 Å [Fe XIV] and the red λ6374 Å [Fe X] coronal lines at various positions in the corona. Extensive microdensitometry followed by multi- Gaussian curve-fitting analysis has resulted in the determination of coronal temperatures and velocity separations between different pockets of coronal gas in the line of sight over a large extent of the corona. Fewer high temperature zones are to be found in the corona of 1983 compared with our similar green-line measurements of the solar maximum corona of 1980. The data are consistent with a temperature maximum occurring at 1.2 Rsun, as found at the 1980 eclipse, but our new data are insufficient to observe farther out than this radius and so determine the position of a maximum. The velocity field in the corona at the 1983 eclipse is less structured compared with that at the 1980 eclipse and is mainly confined to the zone 20-30 km s-1.

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