{"id":135650,"date":"2020-07-06T11:20:05","date_gmt":"2020-07-06T10:20:05","guid":{"rendered":"https:\/\/elspeedo.cz\/nocni-svitici-oblaka\/"},"modified":"2020-07-07T09:09:13","modified_gmt":"2020-07-07T08:09:13","slug":"nocni-svitici-oblaka","status":"publish","type":"post","link":"https:\/\/elspeedo.cz\/pl\/nocni-svitici-oblaka\/","title":{"rendered":"No\u010dn\u00ed sv\u00edt\u00edc\u00ed oblaka"},"content":{"rendered":"
[vc_row][vc_column][vc_column_text]V\u010dera jsme ve Flight Parku Javorov\u00fd sledovali zaj\u00edmav\u00fd \u00fakaz – sv\u00edt\u00edc\u00ed oblaka. A instrukto\u0159i se s kurzem pr\u00e1v\u011b vraceli z tr\u00e9ninku, tak jsem to cvaknul i s nov\u00fdm Lan\u010f\u00e1kem :o).<\/p>\n

No\u010dn\u00ed sv\u00edt\u00edc\u00ed oblaky jsou modrav\u011b nebo st\u0159\u00edb\u0159it\u011b zbarven\u00e9 oblaky nitkovit\u00e9ho charakteru podobaj\u00edc\u00ed se tenk\u00e9mu cirru. Sv\u00fdm tvarem jsou bu\u010f z\u00e1vojovit\u00e9, nebo vytv\u00e1\u0159ej\u00ed \u0161ir\u0161\u00ed p\u00e1s, pop\u0159. maj\u00ed tvar v\u00edru. Barvu mohou m\u00edt i oran\u017eovou a\u017e \u010dervenou a sv\u00fdm zbarven\u00edm se ost\u0159e r\u00fdsuj\u00ed na tmav\u00e9 no\u010dn\u00ed obloze.
\nPoprv\u00e9 byly pozorov\u00e1ny v roce 1885 (v Praze u\u017e 10. 6. 1885). Vyskytuj\u00ed se vz\u00e1cn\u011b a jsou pozorov\u00e1ny mezi 50. a 75. stupn\u011bm severn\u00ed \u0161\u00ed\u0159ky a 40. a 60. stupn\u011bm ji\u017en\u00ed \u0161\u00ed\u0159ky a to jen v letn\u00edch m\u011bs\u00edc\u00edch. Postaven\u00ed Slunce mus\u00ed b\u00fdt 5 – 18 stup\u0148\u016f pod obzorem. Vzhledem k prokazateln\u011b prom\u011bnliv\u00e9mu proud\u011bn\u00ed v mezosf\u00e9\u0159e byly tyto oblaka pozorov\u00e1ny kterak postupuj\u00ed z v\u00fdchodu na z\u00e1pad \u010di ze severoz\u00e1padu na v\u00fdchod a to rychlost\u00ed od 50 do 250 m\/s.<\/p>\n

Fyzik\u00e1ln\u00ed slo\u017een\u00ed<\/strong><\/p>\n

Fyzik\u00e1ln\u00ed slo\u017een\u00ed no\u010dn\u00edch sv\u00edt\u00edc\u00edch oblak\u016f nen\u00ed je\u0161t\u011b zn\u00e1m\u00e9, ale jsou ur\u010dit\u00e9 d\u016fvody pro domn\u011bnku, \u017ee se skl\u00e1daj\u00ed z velmi jemn\u00fdch \u010d\u00e1ste\u010dek kosmick\u00e9ho prachu.
\nNo\u010dn\u00ed sv\u00edt\u00edc\u00ed oblaky byly doposud pozorov\u00e1ny jen velmi vz\u00e1cn\u011b a to jen v severn\u00edch oblastech m\u00edrn\u00fdch \u0161\u00ed\u0159ek severn\u00ed polokoule v letn\u00edch m\u011bs\u00edc\u00edch, kdy\u017e Slunce bylo 5 a\u017e 13 stup\u0148\u016f pod obzorem. Vyskytuj\u00ed se v horn\u00ed \u010d\u00e1sti mezosf\u00e9ry ve v\u00fd\u0161k\u00e1ch 75 – 90 km.<\/p>\n

Vznik<\/strong><\/p>\n

V sou\u010dastnosti nen\u00ed zcela objektivn\u011b jasn\u00e9, jak\u00fdm zp\u016fsobem tato oblaka vznikaj\u00ed. P\u0159edpokl\u00e1d\u00e1 se jejich mimozemsk\u00fd p\u016fvod a to zap\u0159\u00ed\u010din\u011bn\u00edm \u010d\u00e1stic kosmick\u00e9ho \u010di komet\u00e1rn\u00edho prachu (Hoffmeister, St\u00f6rmer, Vestine), anebo (a to m\u00e9n\u011b pravd\u011bpodobn\u011b) prachu z pozemsk\u00fdch zdroj\u016f (sopky, atomov\u00e9 v\u00fdbuchy).<\/p>\n

V roce 1965 p\u0159ich\u00e1zej\u00ed Chapman a Kendall s hypot\u00e9zou, kter\u00e1 navazuje na Wegenerovo zji\u0161t\u011bn\u00ed v\u00fdskytu ledov\u00fdch \u010d\u00e1stic v t\u011bchto v\u00fd\u0161k\u00e1ch. Teorie prav\u00ed, \u017ee jsou slo\u017eeny z ledov\u00fdch krystalk\u016f, kter\u00e9 vznikaj\u00ed z vody vytv\u00e1\u0159ej\u00edc\u00ed se fotochemickou synt\u00e9zou atmosf\u00e9rick\u00e9ho kysl\u00edku s vod\u00edkem, nebo z vody, je\u017e je do t\u011bchto v\u00fd\u0161ek vynesena turbulentn\u00ed dif\u00faz\u00ed. Mechanismus tohoto transportu p\u0159es stratosf\u00e9ru a stratopauzu nen\u00ed v\u0161ak dosud objasn\u011bn a jedn\u00e1 se tud\u00ed\u017e o pouhou domn\u011bnku \u010di spekulaci.<\/p>\n

Zdroj: Atlas oblak\u016f (http:\/\/mraky.astronomie.cz\/)[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=”135332″ img_size=”full” alignment=”center” style=”vc_box_rounded”][\/vc_column][\/vc_row]\n<\/div>","protected":false},"excerpt":{"rendered":"

Par\u00e1dn\u00ed sv\u011bteln\u00e9 show po ned\u011bln\u00edm poletov\u00e1n\u00ed. Chce\u0161 v\u011bd\u011bt o co \u0161lo?<\/p>\n","protected":false},"author":4,"featured_media":135334,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_exclusions":"","_tribe_blocks_recurrence_description":"","footnotes":""},"categories":[544,543,542],"tags":[],"class_list":["post-135650","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-artykuly","category-klub-pl","category-pozostale"],"yoast_head":"\nNo\u010dn\u00ed sv\u00edt\u00edc\u00ed oblaka — El Speedo<\/title>\n<meta name=\"description\" content=\"El Speedo je nejv\u011bt\u0161\u00ed paraglidingov\u00e1 komunita a \u0161kola v \u010cR. 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