Princess Aurora
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Owner:
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KarelKraak
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Released:
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Saturday, November 8, 2008
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Origin:
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Netherlands
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Recently Spotted:
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In the hands of lakesidecnf.
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Prinses Aurora wil graag de aurora borealis (noordelijke poollicht) en de aurora australis (zuidelijke poollicht) zien.
Natuurlijk zijn foto's meer dan welkom...
Princess Aurora would like to see the aurora borealis (northern polar lights) and the aurora australis (southern polar lights).
Of course pictures would be very welcome...
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Het poollicht hangt samen met uitbarstingen (protuberansen) op de zon, waarbij grote hoeveelheden geladen deeltjes het heelal ingeslingerd worden. Het aardmagnetisch veld zorgt ervoor dat de deeltjesstroom in de omgeving van de aarde wordt afgebogen en in de buurt van de noord- en Zuidpool met verhoogde snelheid de atmosfeer binnendringt. De van de zon afkomstige deeltjes bevatten veel energie, die in de bovenste kilometers van de atmosfeer door botsingen wordt overgedragen op zuurstof- en stikstofatomen. Die energie komt uiteindelijk weer vrij en wordt op 80 tot 1000 kilometer hoogte uitgestraald in de vorm van het kleurrijke poollicht.
Aurorae are produced by the collision of charged particles from Earth's magnetosphere, mostly electrons but also protons and heavier particles, with atoms and molecules of Earth's upper atmosphere (at altitudes above 80 km (50 miles)). The particles originate from the Sun and arrive at the vicinity of Earth in the relatively low-energy solar wind. When the trapped magnetic field of the solar wind is favourably oriented (principally southwards) it reconnects with Earth's magnetic field, and solar particles enter the magnetosphere and are swept to the magnetotail. Further magnetic reconnection accelerates the particles towards Earth.
The collisions in the atmosphere electronically excite atoms and molecules in the upper atmosphere. The excitation energy can be lost by light emission or collisions. Most aurorae are green and red emissions from atomic oxygen. Molecular nitrogen and nitrogen ions produce some low level red and very high blue/violet aurorae. The light blue colors are produced by ionic nitrogen and the neutral nitrogen gives off the red and purple color with the rippled edges. Different gases interacting with the upper atmosphere will produce different colors, caused by the different compounds of oxygen and nitrogen. The level of solar wind activity from the Sun can also influence the color of the aurorae.
Gallery Images related to Princess Aurora
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