{"id":49387,"date":"2019-05-02T09:00:52","date_gmt":"2019-05-02T06:00:52","guid":{"rendered":"http:\/\/realitatearutiera.ro\/?p=49387"},"modified":"2019-05-02T09:00:54","modified_gmt":"2019-05-02T06:00:54","slug":"polul-nord-magnetic-al-terrei-se-afla-in-continua-miscare-iar-cercetatorii-au-gasit-acum-cauza","status":"publish","type":"post","link":"https:\/\/realitatearutiera.ro\/?p=49387","title":{"rendered":"Polul nord magnetic al Terrei se afl\u0103 \u00een continu\u0103 mi\u015fcare, iar cercet\u0103torii au g\u0103sit acum cauza"},"content":{"rendered":"\n

C\u00e2mpul magnetic al planetei noastre este responsabil cu blocarea unei mari p\u0103r\u0163i a radia\u0163iilor solare care se \u00eendreapt\u0103 c\u0103tre Terra \u015fi care ar putea s\u0103 conduc\u0103 spre dispari\u0163ia total\u0103 a atmosferei \u015fi oceanului planetar, asigur\u00e2nd condi\u0163iile necesare existen\u0163ei vie\u0163ii a\u015fa cum o \u015ftim pe P\u0103m\u00e2nt.Datele str\u00e2nse de-a lungul ultimului secol i-au determinat de pe oamenii de \u015ftiin\u0163\u0103 s\u0103 concluzioneze c\u0103\u00a0polul nord magnetic<\/a>\u00a0se afl\u0103 \u00een mi\u015fcare, deplas\u00e2ndu-se c\u0103tre nordul geografic cu aproximativ 48 de kilometri pe an. Aceast\u0103 descoperire are dou\u0103 implica\u0163ii majore: prima vizeaz\u0103\u00a0c\u00e2mpul magnetic<\/a> care se afl\u0103, de asemenea, \u00een mi\u015fcare continu\u0103; cea de a doua: World Magentic Model (WMM), folosit pentru determinarea pozi\u0163iei pe glob, inexact. Problemele legate de erorile WMM au determinat armata american\u0103 s\u0103 solicite devansarea actualiz\u0103rii modelului, aceasta fiind programat\u0103 pentru anul viitor.\u00a0Pentru a \u00een\u0163elege modul \u00een care se mi\u015fc\u0103 c\u00e2mpul magnetic \u015fi, odat\u0103 cu el, \u015fi polul nord magnetic, trebuie s\u0103 \u00een\u0163elegem \u015fi cum ia na\u015ftere acesta. Astfel, c\u00e2mpul magnetic care \u00eenconjoar\u0103 Terra este generat de c\u0103tre rota\u0163ia \u00een\u00a0miezul planetei<\/a>, la aproximativ 2.900 de kilometri, a unei mase uria\u015fe de fier \u015fi nichel \u00een stare lichid\u0103 la temperaturi foarte \u00eenalte. Mi\u015fcarea \u015fi distribu\u0163ia masei de metal topit conduce spre modificarea pozi\u0163iei polilor magnetici.\u00a0<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

C\u00e2mpul magnetic al P\u0103m\u00e2ntului\/ Credit foto: 123RF<\/em> P\u00e2n\u0103 de cur\u00e2nd, detectarea \u015fi aproximarea schimb\u0103rilor \u00een c\u00e2mpul magnetic reprezentau o sarcin\u0103 imposibil\u0103 pentru oamenii de \u015ftiin\u0163\u0103. Geofizicienii Julien Aubert \u015fi Christopher Finlay au f\u0103cut pa\u015fi spre determinarea varia\u0163iilor prin utilizarea supercomputerelor<\/a>, noteaz\u0103 Science Alert<\/a>. Cei doi au plecat de la premisa c\u0103 mi\u015fcarea maselor de metal lichid influen\u0163eaz\u0103 starea c\u00e2mpului magnetic \u015fi, ulterior, au aflat c\u0103 \u00een miezul planetei se produc unele anomalii. Aceste anomalii se produc ca urmare a existen\u0163ei unor mase de metal \u00een stare lichid\u0103, care \u00een contact cu metalul lichid mai rece se ridic\u0103. Aceste valuri dau na\u015ftere unor valuri magnetice care ajung s\u0103 influen\u0163eze pozi\u0163ia polului nord magnetic. \u201eG\u00e2ndi\u0163i-v\u0103 c\u0103 aceste valuri vibreaz\u0103 \u00eentr-un mod asem\u0103n\u0103tor cu corzile unui instrument muzical\u201d, a declarat Julien Aubert, unul dintre autorii cercet\u0103rii publicate recent \u00een Nature.<\/p>\n\n\n\n

Importan\u0163a nordului magnetic \u00een naviga\u0163ie<\/h2>\n\n\n\n

Pentru for\u0163ele armate ale Statelor Unite sau cele ale \u0163\u0103rilor europene, determinarea exact\u0103 a nordului magnetic are o importan\u0163\u0103 maxim\u0103, de acesta depind sistemele lor de naviga\u0163ie. De asemenea, existen\u0163a unui World Magnetic Model precis reprezint\u0103 o prioritate pentru utilizatorii civili, companiile aeriene \u015fi chiar aplica\u0163iile care folosesc localizarea GPS, \u00een absen\u0163a acestuia navigarea fiind mult \u00eengreunat\u0103. Din acest motiv, British Geological Survey \u015fi National Oceanic and Atmospheric Administration sunt \u00eens\u0103rcinate cu actualizarea WMM la fiecare cinci ani.  <\/p>\n\n\n\n

Exist\u0103 posibilitatea dezintegr\u0103rii c\u00e2mpului magnetic?<\/h2>\n\n\n\n

C\u00e2mpul magnetic al Terrei \u0163ine la distan\u0163\u0103 radia\u0163iile solare \u015fi protejeaz\u0103 atmosfera de la evaporare, \u00een lipsa acestuia, am putea r\u0103m\u00e2ne f\u0103r\u0103 atmosfer\u0103. Totu\u015fi, posibilitatea ca planeta noastr\u0103 s\u0103 r\u0103m\u00e2n\u0103 f\u0103r\u0103 \u00eenveli\u015ful magnetic este foarte mic\u0103, ca urmare a faptului c\u0103 miezul planetei se va afl\u0103 mereu \u00een continu\u0103 mi\u015fcare, a declarat Justin Revenaugh, seismolog din cadrul University of Minnesota. Un caz foarte improbabil propus de c\u0103tre seismolog implic\u0103\u00a0inversarea polilor magnetici<\/a>, situa\u0163ie \u00een care c\u00e2mpul magnetic \u00ee\u015fi va pierde p\u00e2n\u0103 la o treime din densitate. <\/p>\n\n\n\n

sursa: descopera.ro<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2mpul magnetic al planetei noastre este responsabil cu blocarea unei mari p\u0103r\u0163i a radia\u0163iilor solare care se \u00eendreapt\u0103 c\u0103tre Terra<\/p>\n","protected":false},"author":1,"featured_media":49388,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":""},"categories":[12],"tags":[],"class_list":["post-49387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiri-internationale"],"jetpack_featured_media_url":"https:\/\/i1.wp.com\/realitatearutiera.ro\/wp-content\/uploads\/2019\/05\/646x404.jpg?fit=646%2C404&ssl=1","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p61naM-cQz","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/49387","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=49387"}],"version-history":[{"count":1,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/49387\/revisions"}],"predecessor-version":[{"id":49389,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/49387\/revisions\/49389"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/media\/49388"}],"wp:attachment":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=49387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=49387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=49387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}