Interferometric Study of Profiles of Faint Fraunhofer Lines
Open Access
- 1 February 1957
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 117 (1) , 2-21
- https://doi.org/10.1093/mnras/117.1.2
Abstract
Profiles of well isolated Fraunhofer lines in the red were measured interferometrically by crossing a Fabry–Perot interferometer (with dielectric coating) with the 9 m spectrograph of the Cambridge Observatories. The average effective resolving power was as high as 6 × 10 5 . The wave-length distribution of the selective absorption coefficient was derived from the measured profiles, using Vitense's Model II. For every point of the disk faint lines give broader Doppler widths than do stronger lines. It is suggested that there is a circulation in the solar atmosphere, vertical upward motion in granules being converted into horizontal motion at about τ = 0.4, and finally changing into downward motions back to the convection layer.Keywords
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