{"id":931,"date":"2008-09-29T18:36:24","date_gmt":"2008-09-29T15:36:24","guid":{"rendered":"http:\/\/www.fyysika.ee\/wordpress\/?p=931"},"modified":"2010-03-29T09:37:51","modified_gmt":"2010-03-29T06:37:51","slug":"helkivate-oopilvede-saladus","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=931","title":{"rendered":"Helkivate \u00f6\u00f6pilvede saladus"},"content":{"rendered":"<p><strong><br \/>\nSellel Soomes Saimaa j&auml;rvistul j&auml;&auml;dvustatud fotol n&auml;eme eriskummalisi pilvi, mille &ouml;ine s&auml;ra on lummanud n&auml;gijaid nii oma ilu kui salap&auml;raga.<\/strong><\/p>\n<p>Esmalt kirjeldati niisuguseid &ouml;&ouml;taeva k&otilde;rguses helendavaid pilvi teadaolevalt 1885 aastal ja seni puudus arusaam, mil moel nad saavad umbes 80 kilomeetri k&otilde;rgusel maapinnast tekkida. Mesosf&auml;&auml;ris, kus need pilved tekivad, langeb temperatuur kuni -140&deg;C ja &otilde;hur&otilde;hk on seal 10 000 korda madalam kui<\/p>\n<table width=\"200\" cellspacing=\"1\" cellpadding=\"1\" border=\"0\" align=\"right\" summary=\"\">\n<tbody>\n<tr>\n<td><img decoding=\"async\" src=\"http:\/\/www.fyysika.ee\/pildid\/2909082.jpg\" alt=\"\" \/><\/td>\n<\/tr>\n<tr>\n<td>&nbsp;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>maapinnal. Oli teada, et seal leidub pisikesi j&auml;&auml;kristalle, kuid see ei seleta, miks neist moodustunud pilved peaks v&auml;ga h&auml;sti radarisignaali peegeldama. Just niisuguse kummalise omaduse avastasid helkivatel &ouml;&ouml;pilvedel veerand sajandi eest Alaskal m&otilde;&otilde;tmisi teostanud teadlased. N&uuml;&uuml;d pakkus California Tehnoloogiainstituudi f&uuml;&uuml;sik Paul Bellan selgituse, mille kohaselt sadestub j&auml;&auml;kristallidele meteooridega atmosf&auml;&auml;ri sattunud naatriumi ja raua atomaarne aur. M&otilde;&otilde;tmised n&auml;itavad, et nende metallide kontsentratsioon kahaneb helkivate &ouml;&ouml;pilvede l&auml;heduses enam kui 80% v&otilde;rra. Naatriumi sadenemist j&auml;&auml;kristallidele on varem sarnastel temperatuuridel laboratoorselt uuritud ja tulemused kinnitavad sama protsessi t&otilde;en&auml;olist toimumist pilvedes. <\/p>\n<p>Allikas: <a href=\"http:\/\/mr.caltech.edu\/media\/Press_Releases\/PR13188.html\">Caltech News Releases 25.09.08<\/a><br \/>\nToimetas Erik Randla<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sellel Soomes Saimaa j&auml;rvistul j&auml;&auml;dvustatud fotol n&auml;eme eriskummalisi pilvi, mille &ouml;ine s&auml;ra on lummanud n&auml;gijaid nii oma ilu kui salap&auml;raga. Esmalt kirjeldati niisuguseid &ouml;&ouml;taeva k&otilde;rguses helendavaid pilvi teadaolevalt 1885 aastal ja seni puudus arusaam, mil moel nad saavad umbes 80 kilomeetri k&otilde;rgusel maapinnast tekkida. Mesosf&auml;&auml;ris, kus need pilved tekivad, langeb temperatuur kuni -140&deg;C ja &otilde;hur&otilde;hk [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[16],"tags":[],"class_list":{"0":"post-931","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-teadusuudis","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/931","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=931"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/931\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}