The Corona Spectrum

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

IN your article on the approaching solar eclipse (page 393, paragraph 2), reference is made to the apparent absence of the corona line, 1474 K, from the chromosphere and prominences. I would like to point out that occasionally this line is clearly seen reversed in metallic prominences; and that the form of the prominence, generally a very small one, can be made out with the widened slit as in the other chromosphere lines. Such an instance is recorded by Fenyi, who has published a drawing of the prominence as seen in the lines 6677, C, and 1474 K; the height as measured in the last-named line being 33'' (``Astronomy and Astro-physics,'' xi. 432, 1892).

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