FABRY-PEROT LINE-PROFILES IN THE CHI-5303 A AND CHI-6374 A CORONAL LINES OBTAINED DURING THE 1983 INDONESIAN ECLIPSE

During the total solar eclipse of 11 June, 1983, an imaging dual-channel Fabry-Perot interferometer was used to obtain line profiles simultaneously in the green lambda-5303 angstrom [FeXIV] and the red lambda-6374 angstrom [FeX] 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 R., 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.