{"id":103878,"date":"2026-02-09T07:33:10","date_gmt":"2026-02-09T07:33:10","guid":{"rendered":"https:\/\/www.europesays.com\/ee\/103878\/"},"modified":"2026-02-09T07:33:10","modified_gmt":"2026-02-09T07:33:10","slug":"maa-magnetvali-ja-ohu-hapnikutase-muutuvad-kasikaes-loodus","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ee\/103878\/","title":{"rendered":"Maa magnetv\u00e4li ja \u00f5hu hapnikutase muutuvad k\u00e4sik\u00e4es | Loodus"},"content":{"rendered":"

Kaks p\u00f5hilist asja, mida peaaegu k\u00f5ik inimesed maakera kohta teavad, on see, et meie planeedi atmosf\u00e4\u00e4ris on rohkesti hapnikku, ja see, et maakera \u00fcmbritseb p\u00e4ris tugev magnetv\u00e4li.<\/p>\n

Kuid ka teadlased ei teadnud veel peaaegu t\u00e4nase p\u00e4evani, et need kaks asja v\u00f5ivad olla ka omavahel tihedalt seotud.<\/p>\n

N\u00fc\u00fcd on r\u00fchm Ameerika ja Briti teadlasi t\u00e4hele pannud, et atmosf\u00e4\u00e4ri hapnikusisaldus ja magnetv\u00e4lja tugevus on viimase poole miljardi aasta jooksul muutunud k\u00e4sik\u00e4es.<\/p>\n

Weijia Kuang NASA Goddardi kosmoselennukeskusest Greenbelti linnakeses Washingtoni l\u00e4hedal kirjutab koos kolleegidega ajakirjas Science Advances<\/a>, et avastatud seos v\u00f5ib osutada tugevale sidemele planeedi sisemuses kulgevate protsesside ja planeedi pinnal valitsevate elus\u00f5bralike tingimuste vahel.<\/p>\n

V\u00f5ib-olla ei s\u00f5ltugi maakera eluk\u00f5lbulikkus mitte ainult pinnapealsetest n\u00e4htustest ja atmosf\u00e4\u00e4ris toimuvast, vaid sel on ka palju s\u00fcgavam tagap\u00f5hi.<\/p>\n

<\/p>\n

Maa magnetv\u00e4lja hoiab \u00fclal kuumast p\u00fcdelate rauamasside liikumine maakera tuuma pealiskihtides.<\/p>\n

Liikumine ei ole p\u00e4ris \u00fchtlane ja nii v\u00f5ib magnetv\u00e4li l\u00e4bi geoloogiliste ajastute kord tugevneda, kord n\u00f5rgeneda.<\/p>\n

Maa magnetv\u00e4li kaitseb atmosf\u00e4\u00e4ri P\u00e4ikeselt tulvavate suure energiaga osakeste eest. Kuidas see kaitse t\u00e4pselt toimib, ei ole veel p\u00e4ris selge.<\/p>\n

Kuang ja ta kolleegid hakkasidki hapniku ja magnetv\u00e4lja seoste vastu huvi tundma lootuses saada sellest kaitsetoimest rohkem aimu.<\/p>\n

Nad uurisid andmeid vanade magnetilisest materjalist mineraalide kohta, millesse on magnerv\u00e4lja omaaegsest tugevusest m\u00e4rke j\u00e4\u00e4nud.<\/p>\n

Vanade kivimite ja mineraalide koostise p\u00f5hjal said nad teada kunagisi hapnikutasemeid.<\/p>\n

Kuigi nii magnetv\u00e4lja- kui ka hapnikuandmeid on ajapikku kogunenud rohkesti, ei ole neid varem omavahel palju taibatud k\u00f5rvutada.<\/p>\n

Oma k\u00f5rvutuse p\u00f5hjal saavad Kuang ja ta kaaslased n\u00fc\u00fcd \u00f6elda, et viimase 540 miljoni aasta jooksul, enam-v\u00e4hem kuulsast kambriumi plahvatusest peale, on selge korrelatsioon t\u00e4iesti olemas.<\/p>\n

See osutab v\u00f5imalusele, et n\u00e4htused on ka p\u00f5hjuslikult seotud.<\/p>\n

Millised need p\u00f5hjused olla v\u00f5iksid, teadlased t\u00e4pselt ei tea, kuid kavatsevad edaspidi k\u00f5rvutada veelgi vanemaid andmeid, et teada saada, kas magnetv\u00e4lja ja hapnikutaseme koosmuutusi tuli ette ka maakera kaugemas minevikus.<\/p>\n

Teadusuudised on Vikerraadios eetris esmasp\u00e4evast reedeni ca kell 8.35 ja laup\u00e4eval ca kell 8.25.<\/p>\n","protected":false},"excerpt":{"rendered":"Kaks p\u00f5hilist asja, mida peaaegu k\u00f5ik inimesed maakera kohta teavad, on see, et meie planeedi atmosf\u00e4\u00e4ris on rohkesti…\n","protected":false},"author":2,"featured_media":103879,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[80],"tags":[28170,26,27,37,33,35,34,36,31,32,40363,21,28,29,95,49809,3126,19,25,23,24,22,20,30,92,93,94],"class_list":["post-103878","post","type-post","status-publish","format-standard","has-post-thumbnail","category-maailm","tag-atmosfaar","tag-breaking-news","tag-breakingnews","tag-ee","tag-eesti","tag-eesti-keel","tag-estonia","tag-estonian","tag-featured-news","tag-featurednews","tag-hapnik","tag-headlines","tag-latest-news","tag-latestnews","tag-maailm","tag-maakera","tag-magnetvali","tag-news","tag-populaarseimad-lood","tag-top-stories","tag-topstories","tag-uldised-uudised","tag-uudised","tag-viimased-uudised","tag-world","tag-world-news","tag-worldnews"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ee\/116039516382468810","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/103878","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/comments?post=103878"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/103878\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media\/103879"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media?parent=103878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/categories?post=103878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/tags?post=103878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}