Noctilucent Clouds in Alaska during 1962

Physics

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Scientific paper

SINCE the first reported sightings of noctilucent clouds in 1885, there have been many subsequent observations of them from latitudes ranging between 45° and 63.3°. The majority of these observations have been made from north-western Europe and the U.S.S.R. There appear to be only three previously reported observations of noctilucent clouds from the North American continent: two of these from Canada and one from Alaska. Vestine's observation1 of the clouds from Meanook, Alberta (54° 37' N., 113° 20' W.), on July 20-21, 1933, was the first reported sighting from North America. The second reported sighting from Canada2 was made on the night of July 23-24, 1961, from Saskatoon, Saskatchewan (52° 08'N., 106° 38' W.). The one reported Alaskan sighting3 was made from Anchorage (61° 10' N., 149° 59' W.) on July 27-28, 1957. The lack of noctilucent cloud observations at latitudes higher than 63.3° (the latitude of Torsta, Sweden) was attributed by Ludlam4 to the lack of keen observers at these latitudes.

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