Auroræ: Their Characters and SpectraCapron, J. Rand
History
Auroræ: Their Characters and Spectra
Capron, J. Rand
Auroras
They had even then a peculiarly wild, ragged, and phosphorescent
appearance, and so much resembled some I had seen to accompany the Aurora
of October 1870, that I predicted (as came to pass) a display later in
the evening. A _facsimile_ of my water-colour sketch of this Aurora is
given on Plate IV. fig. 1, while the corona and rays are represented
(with rather too hard an outline) on Plate V. fig. 2.
[Illustration: Plate V.]
_Description of an Aurora seen at Cardiff._
[Sidenote: Aurora seen at Cardiff. Formation of corona.]
An Aurora was seen at Cardiff. A dusky red aspect of the sky towards
the north, and extending itself across the zenith westward, made its
appearance about half-past 5 P.M. The lights reached their greatest
intensity at 6 o’clock, when the sky was suffused with a rich crimson
glow, a broad band of colour reaching from N.E. to W. A corona of deep
hue, having rugged sharply defined edges, stood out prominently in the
zenith, apparently on a parallel plane to the earth, and having its
centre almost immediately over the head of the spectator.
[Sidenote: Radii thrown out from corona.]
From this corona, elliptic in form, and in its broadest diameter about
four times the size of the moon, there were thrown out brilliant silvery
blue radii, extending to the N.E. and W. horizon, and presenting the
appearance of a vast cupola of fire.
[Sidenote: Rain fell when Aurora died out.]
At half-past 6 the lights died completely out, leaving masses of cloud
drifting up from the south, and a shower of rain fell. The corona was
remarked upon as unusual. At Edinburgh the sky was brilliant for several
hours. (The date of this Aurora is uncertain, as the account is from an
undated newspaper cutting. It is supposed to be in February 1872, but
could hardly have been on the 4th, as the Aurora of that date did not
reach its maximum development at Edinburgh till 8 P.M.)
_Mr. J. R. Capron’s Aurora, seen at Guildown, Guildford, February 4th,
1874._
[Sidenote: Silvery brightness in N.E. Light-cloud, which moved from E. to
W. Formation of arc in N. Streamers. Horizontal clouds of misty light.]
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