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Noctilucent Clouds (Paperback, Softcover reprint of the original 1st ed. 1989)
Loot Price: R1,521
Discovery Miles 15 210
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Noctilucent Clouds (Paperback, Softcover reprint of the original 1st ed. 1989)
Series: Physics and Chemistry in Space, 18
Expected to ship within 10 - 15 working days
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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 Degrees 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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