{"id":7998,"date":"2017-07-04T04:51:33","date_gmt":"2017-07-04T04:51:33","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7998"},"modified":"2017-07-28T07:18:34","modified_gmt":"2017-07-28T07:18:34","slug":"curiosite-couronne-de-pollen-autour-de-pleine-lune","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/07\/04\/curiosite-couronne-de-pollen-autour-de-pleine-lune\/","title":{"rendered":"Curiosit\u00e9 : une couronne de pollen autour de la Pleine Lune"},"content":{"rendered":"

Des couronnes de pollen sont parfois observ\u00e9es autour de la Lune ou du Soleil \u00e0 la fin du printemps. Saurez-vous les reconna\u00eetre ?<\/strong><\/p>\n

Peut-\u00eatre avez-vous d\u00e9j\u00e0 observ\u00e9 des couronnes color\u00e9es autour de la Lune quand sa lumi\u00e8re nous parvient apr\u00e8s avoir travers\u00e9 les gouttelettes d’eau pr\u00e9sentes dans certains nuages. On parle alors de couronne lunaire<\/a>. Mais ce qu’a photographi\u00e9 Matti Helin<\/a> en Finlande le 10 juin \u00e0 l’occasion de la Pleine Lune des fraises<\/a> est un peu diff\u00e9rent.<\/p>\n

\"\"<\/a><\/p>\n

Il s’agit d’une couronne de pollen produite par la\u00a0diffraction de la lumi\u00e8re \u00e0 travers une multitude de grains de pollens en suspension dans l’atmosph\u00e8re.<\/p>\n

\u00c0 cette \u00e9poque de l’ann\u00e9e ce sont surtout les c\u00f4nes de pin m\u00e2les qui rel\u00e2chent une grande quantit\u00e9 de pollen port\u00e9 par les vents pour se m\u00e9langer avec les oosph\u00e8res que lib\u00e8rent les c\u00f4nes femelles (l’\u00e9quivalent des ovules chez les animaux), provoquant de v\u00e9ritables nuages d’une poussi\u00e8re jaune qui se d\u00e9pose un peu partout. Ces pollens dont les grains font plusieurs dizaines de microns produisent de petites couronnes assez caract\u00e9ristiques, parfois tr\u00e8s color\u00e9es, et toujours tr\u00e8s proches en apparence des sources dont elles diffusent la lumi\u00e8re.<\/p>\n

On a le plus de chances d’observer de telles couronnes en fin d’apr\u00e8s-midi et \u00e0 la tomb\u00e9e de la nuit quand\u00a0les c\u00f4nes ont rel\u00e2ch\u00e9 du pollen pendant toute la journ\u00e9e. Comme les grains de pollen ne sont pas tous sph\u00e9riques, il est m\u00eame parfois possible d’observer des couronnes elliptiques.<\/p>\n

N’h\u00e9sitez pas \u00e0 faire un tour dans la galerie d’images consacr\u00e9e aux ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques<\/a> pour d\u00e9couvrir leur vari\u00e9t\u00e9 et leur beaut\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"

Des couronnes de pollen sont parfois observ\u00e9es autour de la Lune ou du Soleil \u00e0 la fin du printemps. Saurez-vous les reconna\u00eetre ? Peut-\u00eatre avez-vous d\u00e9j\u00e0 observ\u00e9 des couronnes color\u00e9es autour de la Lune quand sa lumi\u00e8re nous parvient apr\u00e8s avoir travers\u00e9 les gouttelettes d’eau pr\u00e9sentes dans certains nuages. On parle alors de couronne lunaire. … Continuer la lecture de Curiosit\u00e9 : une couronne de pollen autour de la Pleine Lune<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7999,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[2258,2256,1231,2257,1663],"class_list":["post-7998","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-cone-de-pin","tag-couronne-de-pollen","tag-finlande","tag-matti-helin","tag-pleine-lune-des-fraises"],"yoast_head":"\nCuriosit\u00e9 : une couronne de pollen autour de la Pleine Lune<\/title>\n<meta name=\"description\" content=\"Des couronnes de pollen sont parfois observ\u00e9es autour de la Lune ou du Soleil \u00e0 la fin du printemps. 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