Abstract
During the total solar eclipse, 1965 May 30, a 25 cm aperturef/8.0 telescope and Fabry-Perot interferometer were operated aboard the USAF-AEC aircraft. High resolution spectra of the Fexiv emission line, 530.3 nm, were obtained. Deconvolved intensity vs wavelength profiles of the second order fringe overlay a helmet structure on the NM limb at out to 1.37R ⊙. The profiles yield coronal temperatures, absolute intensities and Doppler velocities in regions of apparently open magnetic field structure and within the closed field lines of the helmet. Together with white light intensities the observations are interpreted to provide temperatures and turbulent velocities in and around this coronal structure. Comparison is made with a model by Billings and Roberts. We suggest a model with radial flow (solar wind) velocities of ∼ 60 km s−1 satisfies the observations in the open field line region.
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Work performed under the auspices of the U.S. Atomic Energy Commission, and portions of the analysis at the National Center for Atmospheric Research, Boulder, Colo.
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Liebenberg, D.H., Bessey, R.J. & Watson, B. Observed coronal temperatures at 1.37R ⊙ in the region of a helmet structure. Sol Phys 40, 387–396 (1975). https://doi.org/10.1007/BF00162385
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DOI: https://doi.org/10.1007/BF00162385