Abstract
OBSERVATIONS OF THE INFRA-RED SPECTRUM OF THE SOLAR CORONA.βIn a recent issue of the Comptes rendus (vol. cxxxi. pp. 658β661), M. Deslandres describes some of his latsst experiments in connection with the detection of the solar corona at ordinary times without the intervention of an eclipse. All the methods adopted prior to 1894 had been modifications of spectroscopic examination, using either the visual or ultra-violet rays, and were probably unsuccessful owing lo the great proportion of these radiations existing in our general sky illumination, thereby diluting the small direct coronal light. In 1894 M. Deslandres found evidence that the sky radiation was very poor in the infrared region, while the corona emitted this light abundantly, and this has since been investigated by Prof. Hale, in 1895, without producing any confirmatory results. M. Deslandres here suggests, however, that this non-success may have been due to those experiments having been made near the period of maximum sun-spot activity, at which time the corona is much more uniformly distributed round the limb than at periods of minimum.
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Our Astronomical Column . Nature 63, 67β68 (1900). https://doi.org/10.1038/063067a0
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DOI: https://doi.org/10.1038/063067a0