Sun corona

Definition and stakes

Arabella B. Buckley,  Through Magic Glasses and Other Lectures

“ Of the corona I cannot tell you much, except that it is far more subtle than anything we have spoken of yet; that it is always strongest when the sun is most spotted; that it is partly made up of self-luminous gases whose bright lines we can see, especially an unknown green ray; while it also shines partly by reflected light from the sun, for we can trace in it faint dark lines; lastly it fades away into the mysterious zodiacal light, and so the sun ends in mystery at its outer fringe as it began at its centre. ”
Source: Gutenberg

Portrait of Richard Anthony Proctor Richard Anthony Proctor,  Popular Science Monthly (1872)

“ Several astronomers at once pointed out that the air which lies toward the place on the heavens where the corona is seen, is not illuminated at all by the sun's rays during total eclipse. I also pointed out that whatever light that particular part of the air receives during totality—not direct sunlight, but light from the prominences, and so much of the corona as might be admitted to be solar—would extend over the very place of the moon, and gradually increase thence on all sides instead of gradually diminishing, as happens with the corona. ”
Source: Wikisource

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