Noctilucent Clouds Michael Gadsden

ISBN: 9783642486289

Published: April 9th 2012


165 pages


Noctilucent Clouds  by  Michael Gadsden

Noctilucent Clouds by Michael Gadsden
April 9th 2012 | Paperback | PDF, EPUB, FB2, DjVu, audiobook, mp3, ZIP | 165 pages | ISBN: 9783642486289 | 9.34 Mb

An atmospheric phenomenon is considered as explained when we have succeeded in deducing it on the basis of accepted principles of physics. (H. Ertel, Methods and problems of dynamical meteorolo gy, p. l) Until recently, noctilucent clouds were regarded merely as a curious atmos pheric phenomenon, the occurrence of which aroused only limited scientific attention. However, in the last two decades the interest they have been given has markedly increased. The clouds, usually pale blue in colour, may be seen on a clear night at high latitudes. Typical examples are illustrated in the book.

Clouds looking like these in daytime would be classified as cirrostratus. What sets noctilucent clouds apart is their occurrence in the middle of the night, their very obvious pale blue colour, and their disappearance into the dawn close to the onset of civil twilight when the Sun is 6 below the horizon.

as being set apart from ordinary Noctilucent clouds were first recognized clouds in 1884/1885 and in a series of sightings that followed their return in the summer of 1885. That year marked the beginning of observations and the interpretation of twilight phenomena.

The impetus came from the extraordi nary Krakatoa eruption, which was not only one of the most spectacular volcanic eruptions in recorded history, but which also turned out to be a startling event in atmospheric science with repercussions even in our time.

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