vlastnosti
Vznik [úprava]
Polárna žiara vzniká, keď elektricky nabité častice slnečného vetra, hlavne elektróny ale aj protóny, alfa-častice a niektoré ťažké ióny dopadajú na vrchnú vrstvu zemskej atmosféry. To spôsobuje svetielkovanie molekúl vzduchu. Náraz častice spôsobí u molekuly/atómu nabudenie zodpovedajúce zmenenej elektrónovej konfigurácii. Po krátkom čase a nasledujúcom „uvoľnení“ je vylúčené svetlo (fotón), všeobecne sa tomu hovorí fluorescencia alebo rekombinácia. Aj výbuchy atomových bômb vo vysokých vrstvách atmosféry (400 km) vyvolávajú podobnú reakciu ako napríklad test - Starfish Prime-Test USA 9. júla 1962.
Polárne žiary sa vyskytujú hlavne v polárnych oblastiach, pretože častice slnečného vetra, - elektricky nabitá plazma s priemernou rýchlosťou približne 500-833 km/s (až do 3 000 000 km/h) a s hustotou pribl. 5 × 106 častíc na m3 v blízkosti zeme, sú vychýlené magnetickým poľom Zeme pozdĺž línií magnetického poľa a sú nachýlené k pólom. V oblasti polov smeruje magnetické pole kolmo k povrchu Zeme, a častice môžu vstúpiť do atmosféry. Plazma potrebuje k vniknutiu 2-4 dni pri vzdialenosti Zem- Slnko približ. 150 mil. km.
Polárne žiary sa vyskytujú na Zemi v okolí severného pólu Aurora borealis a v blízkosti južného pólu Aurora australis. V okolí magnetických pólov je výskyt polárnych žiar najvyšší, ale výnimočne sa môžu objaviť aj v našich zemepisných šírkach, dokonca aj na rovníku. Nakoľko slnečný vietor zaplavuje rovnomerne celú guľoplochu s polomerom vzdialenosti Zeme, vyskytujú sa polárne žiary naraz na severnom aj južnom póle. Polárne žiary sa vyskytujú aj na iných planétach slnečnej sústavy, na všetkých, ktoré majú magnetické pole a atmosféru.
Aj ked v mnohých krajinách existujú pranostiky a predpovede polárnej žiary, nemá polárna žiara s počasím nič spoločné. Polárne žiary vznikajú vo výškach od 60 km, ďaleko nad troposférou, vrstva v ktorej sa odohrávajú všetky zmeny počasia siaha len do výšky približne 15km.
Častosť výskytu [úprava]
Výskyt a svetlosť polárnej žiary závisí od sily slnečného vetra, ktorý je zase závislý od aktivity slnka. Pretože slnko má dvanásťročný cyklus aktivity, výskyt polárnych žiar kolíše tiež v tomto cykluse. Obzvlášť v čase maximálnej aktivity, to znamená pri zvlášť silnom slnečnom vetre, sa objavujú polárne žiary v nižších zemepisných šírkach ako napr. stredná Európa. V jeseni 2003 bola preukázateľne pozorovaná polárna žiara v severnom Taliansku.
Mýty a legendy [úprava]
Inuiti pokladali v minulosti polárnu žiaru za pochodne, ktorými ich predkovia osvetľujú úzky most do nebeskej ríše, aby duše mŕtvych našli cestu. V stredovekej Európe boli považované za dych hrdinských bojovníkov. V Nórsku k polárnej žiare prechovávali posvätnú úctu, ale v mnohých krajinách ju považovali, podobne ako kométy, za predzvesť moru, vojny alebo smrti.
Fyzikálne vlastnosti [úprava]
Spektrum polárnej žiary je čiarové. Jej farba zodpovedá časticiam, ktoré ju vyžarujú. Červená farba je vysielaná atómami kyslíka z výšky nad 200 km. V nižších výškach vyžaruje kyslík intenzívnu zelenú farbu. Modrá farba zase pripadá na atómy dusíka vo výške 100 až 200 km. V najnižších vrstvách je žiarenie dusíka karmínové.
Komentáře
Přehled komentářů
I truly love your blog.. Very nice colors & theme. Did you create this web site yourself? Please reply back as I'm attempting to create my own website and want to find out where you got this from or just what the theme is called. Thanks! nessr.naoblal.se/advice-girlfriends/laettlagad-och-supergod-middag.php lättlagad och supergod middag
american pancakes filmjölk naoblal.se
(naoblal.se, 8. 10. 2020 2:11)
I believe what you posted was actually very reasonable. But, what about this? what if you were to write a awesome headline? I am not saying your content is not solid, but what if you added a title that makes people desire more? I mean is kinda boring. You ought to peek at Yahoo's home page and see how they create article headlines to grab people to click. You might add a video or a pic or two to get readers excited about what you've written. Just my opinion, it might bring your posts a little bit more interesting. prosla.naoblal.se/advice-girlfriends/american-pancakes-filmjoelk.php american pancakes filmjölk
vävnad i tuskaft infoforwomen.be
(infoforwomen.be, 12. 9. 2020 9:48)
you are really a excellent webmaster. The site loading pace is amazing. It seems that you are doing any unique trick. Moreover, The contents are masterpiece. you have performed a fantastic job on this subject! https://infoforwomen.be/map1.php vävnad i tuskaft
XRumer 19.0 + XEvil 5.0 solve ANY hard captcha
(Natashatig0353, 18. 8. 2020 8:29)
Absolutně nová aktualizace balíčku SEO / SMM "XRumer 19.0 + XEvil 5.0":
captcha řešení Google, Facebook, Bing, Hotmail, SolveMedia, Yandex,
a více než 12000 dalších kategorií captcha,
s nejvyšší přesností (80 až 100%) a nejvyšší rychlostí (100 img za sekundu).
Můžete připojit XEvil 5.0 k nejoblíbenějšímu softwaru SEO / SMM: XRumer, GSA SER, ZennoPoster, Srapebox, Senuke a více než 100 dalších softwarů.
Zájem? Existuje spousta nepřehledných videí o XEvile na YouTube.
Hodně štěstí!
Are you 18? Come in and don't be shy!
(AllenChula, 26. 7. 2020 9:14)Hurry up to look into loveawake.ru you will find a lot of interesting things
Hi! Only from 18+!
(SandraBeete, 19. 6. 2020 11:11)Hurry up to look into loveawake.ru you will find a lot of interesting things....
aresgrb.se
(aresgrb.se, 18. 5. 2020 7:36)
It's really very difficult in this busy life to listen news on Television, therefore I only use web for that purpose, and get the hottest information.
hmbuqkeuxrhn
(ohtmgpbm, 2. 5. 2020 10:39)viagra prodaja hr https://genviagraget.com/ - viagra safe online order viagra ticker symbol foods containing natural viagra
Eskadron -- brand adored by jockeys all around the world
(CyberXdum, 1. 4. 2020 21:03)
Eskadron is one of the most valued equestrian brands in the world that focuses primarily on the creation of top quality design clothing and equipment. This German concern was set by Pikeur wanting to meet up with the jockeys' needs, have been searching for professional but also stylish equestrian accessories. Thus, why is Eskadron therefore special and why their collections are so popular with passengers?Eskadron -- why do riders from all around the world love this brand?
Eskadron continues to be tremendously popular among horseriding fans for a dozen or even more years today. This new products are distinguished by their own top quality attention to detail. Eskadron can be appreciated for their unique practicality, elegance, and innovativeness in their own projects, modern design and style, and availability. The new offer has both professional ones and items for recreational riders. So, you'll discover basic equestrian clothing, professional design, and assorted accessories necessary for your appropriate saddling of a horse. Eskadron offers saddle fabrics, halters, rugs, bell boots for horses, boots, fly vases, bandages, however in addition hoodies, tshirts, breeches, also reveal jackets. All products come from the European Union, which additionally verifies their quality.Eskadron's collections
Eskadron has many collections. Some are seasonal, others are constantly available in their own offer. The very popular collections of the brand are:
Vintage Sports - launched twice a year, this line consists only of horse equipment. Products using this collection are extremely easy, in conventional soft colours but at the same time quite tasteful.
Platinum - launches once a year for people who prefer conventional solutions. You will mostly find black and gray colors combined with delicate picture motifs.
Young Star - lineup for kids that begin their adventure with horse riding. It's basic horse riding accessories in bright colors and exceptional designs.
Equestrian Fanatics - clothing line created for riders that like to stick outside. Available jackets, hoodies, and backpacks successfully unite casual clothing with equestrianism.
Classic offer - Their constant offer of clothing, equipment, and accessories. It is possible to find services and products useful for training and regular rides but also elegant show clothing.
Eskadron can be a fresh used by riders from all over the world. For the comfort of riding and safety both yours and your horse, it is well worth buying highquality articles, which may permit one to fully appreciate this sport that is exceptional.
Reviews about Currency Trading Brokers
(Brokerslisk, 3. 3. 2020 23:47)
currency-trading-brokers.com/forex-comparisons-ratings-reviews-spain.html Repaso-revisando cima-top forex compañías-empresas.
Simple question about our life.
(Cindyhok, 26. 7. 2019 2:08)
Hi, a have one question.
What all people doing here?
Why we dont living with real life?
Boulder Craigslist
(Phillipsek, 2. 7. 2019 11:19)Craigslist is surely an online, local, classified listing, where everyone can post or discover a wide variety of items available, open job listings, apartments to book; homes and cars for…. Paste this text to generate an HTML img tag in which you would like the image to appear:. One will likely be your actual current email address that you've just given to Craigslist inside the creation within your post. Return towards the tab or window containing your Photobucket pictures should you have more to incorporate. These software platforms allow with the incorporation of widgets produced by third-party developers.
How do you watch free movies online without downloading?
(AbramSam, 1. 6. 2019 19:38)
https://aladdin-fullmovie.net/
https://annabellecomeshomefullmovie.com/
https://darkphoenixfullmovie.net/
https://thesecretlifeofpets2-fullmovie.de/
cliner.imwmalt.be
(cliner.imwmalt.be, 30. 5. 2019 16:59)
Superb, what a webpage it is! This webpage presents valuable information to us, keep it up.
cliner.imwmalt.be
Without stucking anything up my vigina including fingers and i Us porn but how do i get really wet and horny?.
(Robertnaf, 28. 5. 2019 22:18)
https://aladdinfullmovie.net
https://johnwickchapter-3.com
https://avengersendgamefullmovie.com
https://avengersendgamefull.com
https://shazamfullmovie.com
https://shazamfull.org
https://hellboyfullmovie.org
https://wonder-park.com
https://darkphoenixfullmovie.net/
https://toystory4fullmovie.net/
https://spidermanfarfromhome.org
https://annabellecomeshomefullmovie.com/
https://aladdin-fullmovie.net/
https://darkphoenix-fullmovie.de/
https://thesecretlifeofpets2-fullmovie.de/
https://godzillakingofthemonsters.org/
osrab.imwmalt.be
(osrab.imwmalt.be, 27. 5. 2019 2:14)
Your way of explaining everything in this piece of writing is in fact good, every one can simply understand it, Thanks a lot.
osrab.imwmalt.be
budn.wommpri.be
(budn.wommpri.be, 21. 5. 2019 4:44)
I every time used to study article in news papers but now as I am a user of net thus from now I am using net for articles, thanks to web.
budn.wommpri.be
https://fullmovie.aladdin-fullmovie.de/veerediwedding/
(ThomasMug, 21. 5. 2019 1:27)
https://fullmovie.aladdin-fullmovie.de/gameoverman/
https://fullmovie.aladdin-fullmovie.de/johncarter/
https://fullmovie.aladdin-fullmovie.de/westofhell/
https://fullmovie.aladdin-fullmovie.de/woram/
https://fullmovie.aladdin-fullmovie.de/transcendence/
https://fullmovie.aladdin-fullmovie.de/themanor/
https://fullmovie.aladdin-fullmovie.de/thedarkkingdom/
https://fullmovie.aladdin-fullmovie.de/bookclub/
https://fullmovie.aladdin-fullmovie.de/hoteltransylvania3summervacation/
https://fullmovie.aladdin-fullmovie.de/fallgirls/
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51
lättlagad och supergod middag naoblal.se
(naoblal.se, 8. 10. 2020 18:54)