On the Fabry-Perot investigations of the solar corona: Eclipse observations of the green line intensities and half widths

Computer Science

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Brightness, Fabry-Perot Interferometers, Line Spectra, Solar Corona, Solar Eclipses, Sun, Emission Spectra, Ghosts, Image Filters, Monochromatization, Observation

Scientific paper

Eclipse data on intensity and half width of the green coronal line obtained using a Fabry-Perot Interferometer (FPI) combined with a blocking Interference Filter (IF) are presented. Demerits of an FPI (necessity of preliminary monochromatization, ghost images, white corona contribution) are discussed. To get reliable data, blocking filters with FWHM of 2 A and 8 A should be used for the red and green lines, respectively. Requirements for transmission at far wings are extremely strict. According to the eclipse interferograms of the solar corona of 1972 and 1981, the green line intensity varies versus distance as 10-5 to 15. On the average, different coronal structures can be characterized by different values of half width: streamers 0.82 A, helmets 0.88 A, and holes 1.00 A.

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