{"id":127971,"date":"2019-07-16T20:20:23","date_gmt":"2019-07-16T20:20:23","guid":{"rendered":"https:\/\/www.bnreport.com\/night-shining-noctilucent-clouds-have-crept-south-this-summer\/"},"modified":"2019-07-16T20:20:23","modified_gmt":"2019-07-16T20:20:23","slug":"night-shining-noctilucent-clouds-have-crept-south-this-summer","status":"publish","type":"post","link":"https:\/\/www.bnreport.com\/en\/night-shining-noctilucent-clouds-have-crept-south-this-summer\/","title":{"rendered":"Night-shining noctilucent clouds have crept south this summer"},"content":{"rendered":"

High in the sky, sunlit wisps remain aglow even after sundown. This summer, a surprising number of such noctilucent, or \u201cnight-shining,\u201d clouds have been spotted in the Northern Hemisphere \u2014 and, unusually, as far south as Oklahoma and New Mexico<\/a>, scientists report.<\/p>\n

These clouds typically float in the mesosphere about 80 kilometers above Earths surface, and are visible at high latitudes. They gleam blue or white when they catch the suns rays, even after the night has fallen on land. \u201cTheyre beautiful,\u201d says James Russell, an atmospheric scientist at Hampton University in Virginia. \u201cIts hard to take your eyes off of them, because theyre so iridescent.\u201d<\/p>\n

The clouds form when cold temperatures, around \u2212130\u00b0 Celsius, cause water vapor to condense and freeze around dust particles, making nanometer-sized ice crystals. What stood out in June was how wet the mesosphere was. \u201cIts record-setting,\u201d says Lynn Harvey, an atmospheric scientist at the University of Colorado Boulder.<\/p>\n

Possible explanations for that extra wetness include more moist air ascending in summertime than usual, or an increase in the atmosphere of methane, which can be oxidized to form water vapor.<\/p>\n

    <a href=\"https:\/\/www.sciencenews.org\/article\/night-shining-noctilucent-clouds-have-crept-south-summer\" rel=\"noreferrer noopener\" target=\"_blank\"><strong>Read More \u2013 Source<\/strong><\/a>\n<\/code><\/pre>\n
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High in the sky, sunlit wisps remain aglow even after sundown. This summer, a surprising number of s..<\/p>\n","protected":false},"author":1,"featured_media":127972,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-127971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science"],"yoast_head":"\nNight-shining noctilucent clouds have crept south this summer - Business News Report<\/title>\n<meta name=\"description\" content=\"High in the sky, sunlit wisps remain aglow even after sundown. 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