Evershed-Type Lines at the Solar Limb

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Abstract
From spectra of the extreme limb of the Sun 13 faint emission lines have been detected, in the H and K region, which do not appear in Mitchell's list of chromospheric lines. Four of these lines have previously been observed by Jewell and Evershed and have been ascribed by Thackeray, following Menzel's “ c -line” identifications, to rare-earth elements. These identifications are found to be due to chance coincidences of wavelength and it is shown from intensity measurements that with one exception the 13 lines do not extend into the chromosphere. It is concluded that these “emission lines” are probably narrow gaps between the numerous faint absorption lines which fill this region of the spectrum.

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