Physics
Scientific paper
Jul 1902
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1902natur..66..294h&link_type=abstract
Nature, Volume 66, Issue 1708, pp. 294-296 (1902).
Physics
Scientific paper
THERE was a very fine example of red sunset after-glow visible here on the evening of the 26th ult., which presented with rather remarkable appropriateness to the date of its appearance, as immediately occurred to me while watching the impressive sight, a scene of transcending splendour of nature's own elaboration which could hardly have been much surpassed in grandeur by what England's great display of rare illuminations on that night would undoubtedly have been, if a check most sorely sad and grievous had not interposed a throb of deep sorrow on the nation, eliciting good proofs of its heartfelt sympathy and loyalty so universally and strongly as to prevent those sumptuous light displays from being used as auspiciously as they were hoped to be to celebrate the joyfully expected ``Coronation-day'' of 1902. The sun set at about 8h. 25m. with its orange-yellow disc unhazed, and only shorn of rays by a few faint cirrus cloud-streaks close to the horizon, the sky being elsewhere apparently quite free from clouds. At about 8h. 40m. a long low belt of sky extending 70° or 80° along the northwest horizon had grown orange-yellow, streaked with a few faint lines of red and gradually diluted upwards at a height of 15° or 20° into pale shades of light yellow. A ruddiness of the sky in the east had at the same time risen nearly to the zenith, and through its natural blue tint there the sky passed gradually to white about half-way from the zenith to the west horizon, while under this white tract (about 30° in width) lay the bright belt of orange light with its shades of yellow gradually deepening downwards. But at about 8h. 45-50m. the pure white interval between the ordinary blue and the yellow-tinted regions was gradually invaded, and at last quite occupied, by the advancing ruddy colour from the east; and until about 8h. 55m. a space from 30° of altitude in north-west to near and somewhat beyond the zenith, and for 40° or 50° to either side of a vertical line through the place of sunset, presented a broad expanse of rich rose-coloured, lake-red light pervading all the sky's north-western quarter with a fine wide blaze, against the purple glare of which tall trees and houses all looked sharply silhouetted, and for a short space of about ten minutes that the rose-red colour lasted, all objects of the landscape facing towards the west looked conspicuously crimsoned. The ruby-tinted glow sank rather rapidly in height, and by 9 p.m. it had subsided into the summit of a lower and far brighter pinkish-orange bank of light about 30° high, the lower layers of which formed a belt 12° or 15° in height stretching for about 90° along the west-to-north horizon in a blaze of yellow amber or of ochre-yellow colour. No radiating streamers or shadow-beams crossed either the previous purple glow or this orange-reddish, domelike bank of light; but the latter light-field's splendid flood of unflecked, evenly-spread colour sank very gradually, preserving its length, to 12° or 15° in altitude by 9h. 15m., growing less ruddy, and assuming pretty uniformly then throughout the horizon layer's yellow-ochre colour. As its brightness had then very sensibly diminished, no further watch was kept on its later changes of appearance.
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