During the total solar eclipse of 11 June 1983 over Java, Indonesia, a dual-channel Fabry-Perot interferometric system was used to study simultaneously the coronal emission lines at 5303 Å (Fe xiv) and at 6374 Å (Fe x). The two coronal lines were spatially separated by a multilayer interference beam splitter; the beams then entered two separate optically contacted Fabry-Perot systems operating off-axis. The resulting interference fringes were imaged on fine-grain film. Initial results indicate an emission corona confined largely within 1.2 R⊙. Doppler temperatures derived from the width of the 5303-Å line appear to be appreciably lower than similar temperatures determined during the solar-maximum eclipse of 1980.
© 1984 Optical Society of America
Original Manuscript: September 27, 1983
Published: February 1, 1984
T. Chandrasekhar, N. M. Ashok, J. N. Desai, Jay M. Pasachoff, and K. R. Sivaraman, "Fabry-Perot interferometric observations of the coronal red and green lines during the 1983 Indonesian eclipse," Appl. Opt. 23, 508-512 (1984)