Abstract
Attempts to photograph the Corona without an Eclipse.—A. Hnatek contributes a note to Astr. Nach., 5652, in which he refers to the attempts of Herr Blunck to photograph the corona in full sunlight by the use of plates sensiised for infrared light, and special light-filters. Herren Kienle and Siedentopf afterwards gave reasons to doubt whether the images obtained by Herr Blunck were really coronal: A. Hnatek agrees with Kienle and Siedentopf in considering the images spurious. He describes some experiments of his own which gave markings resembling the corona round the sun, but their coronal nature was afterwards disproved. He thinks that coronal photography in daylight would be feasible only on the supposition that the coronal light was relatively much stronger in the infra-red than ordinary sunlight; he gives reasons for thinking that such is not the case. It would seem to be a safe precaution that those claiming to have taken such photographs should take photographs at times when the moon is just outside the sun,s disc. Failure to show the moon,s outline at such times would definitely disprove the coronal origin of any markings visible on the plates.
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Our Astronomical Column. Nature 124, 459 (1929). https://doi.org/10.1038/124459a0
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DOI: https://doi.org/10.1038/124459a0