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

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  1. T. Chandrasekhar, J. N. Desai, P. D. Angrezi, Appl. Opt. 20, 2172 (1981).
    [Crossref] [PubMed]
  2. T. Chandrasekhar, Ph. D. Thesis, Gujarat University, 1982.

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T. Chandrasekhar, Ph. D. Thesis, Gujarat University, 1982.

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Figures (3)

Fig. 1
Fig. 1

Schematic diagram of the eclipse experimental setup.

Fig. 2
Fig. 2

Coronal interferogram in λ5303 Å; exposure time: 3 min 30 sec.

Fig. 3
Fig. 3

Coronal interferogram in λ6374 Å; exposure time: 3 min 40 sec.

Tables (3)

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Table I Exposure Sequence during Totality

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Table II Etalon Parameters

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Table III Microdensitometry of Profiles

Equations (1)

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λ λ corr λ = 7.16 × 10 - 7 T m ,