CORONA - ANIMIRANE SLIKE

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CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:40 pm


POLARNA SVETLOST - CORONA AUSTRALIS I KORONA BOREALIS

Pošto su obe aurore istog porekla naučnici pojavu nazivaju "polarna aurora" ("aurora polaris" - lat. severna zora). Ime "severna zora" je nastalo od utiska koji se stiče pri pojavi aurore, posebno gledano iz Evrope - na severnom horizontu se ukazuje crvenkasta svetlost kao, na sto se to dogadja u zoru, pred izlazak Sunca. Danas je poznato da auroru izazivaju elektroni sa energijama u opsegu 1-15keV, tj. elektroni koji su ubrzani naponom od 1.000V do 15.000V. Svetlost nastaje kada se ti elektroni sudaraju sa atomima u gornjim slojevima atmosfere, obično na visinama 80-150 km. U svetlu preovlađuje emisija atomskog kiseonika - zelenkasta linija na 557,7 nm i (naročito kod elektrona niže energije i na većim visinama) i tamno crvena linija na 630,0 nm. Obe linije potiču od zabranjenih prelaza atomskog kiseonika sa energetskih nivoa koji su (u odsustvu sudara) stabilni čime se objašnjava sporo paljenje i gašenje (0,5 - 1 s) aurorinih zrakova. Mnoge druge spektralne linije takođe su zastupljene, naročito one molekularnog azota, i one se pale i gase mnogo brže, otkrivajući pravi dinamički karakter aurora. Aurora sest neprekidno menja na nebu („aktivna aurora“). Svaka zavesa se sastoji od brojnih paralelnih zrakova, usmerenih u pravcu lokalnog magn javlja ili kao „difuzno svetljenje“ ili kao „zavesa“ koja se širi u pravcu istok-zapad. Ponekad se obrazuju „mirni lukovi“ a nekada se svetloetnog polja što navodi na pomisao da je aurora uslovljena Zemljinim magnetnim poljem. Pojava polarne svetlosti vezana je za magnetne bure koje su povezane sa aktivnoscu Sunčevih pega. Takođe je uočeno da do geomegnetnih bura najčešće dolazi u vreme ravnodnevice, dakle u rano proleće ili jesen što je pomalo zagonetno jer aktivnost na polovima nema mnogo veze sa godišnjim dobima.



Last edited by Admin on Fri Oct 07, 2016 2:03 pm; edited 5 times in total

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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:42 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:45 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:46 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:47 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:49 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Tue Sep 20, 2016 11:51 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:33 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:37 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:41 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:43 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:45 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:46 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:48 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 1:49 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 2:01 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:34 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:35 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:36 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:37 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:38 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:40 pm




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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:40 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:42 pm



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Re: CORONA - ANIMIRANE SLIKE

Post by Admin on Fri Oct 07, 2016 4:43 pm



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Re: CORONA - ANIMIRANE SLIKE

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