Northern lights


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Northern lights

  1. 1. By Ricky Sims & Tonisha Muhammad
  2. 2.  Aurora is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere. The charged particles originate in the magnetosphere and solar wind and, on Earth. They are directed by the Earth’s magnetic field into the atmosphere. Aurorae occur in a band known as the auroral zone. Aurora is classified as diffuse or discrete aurora. Diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even on a dark night and defines the extent of the auroral zone. Discrete aurora are sharply defined features within the diffuse aurora which vary in brightness form just barely visible to the naked eye to bright enough to read a newspaper at night.
  3. 3. Changes simultaneously in the northern auroral zone and is visible from high southern latitudes in Antarctica, South America, and Australia.
  4. 4. There are two vertical composition patterns but the onewe look at is the Ionosphere which is a deep layer ofelectrical charged molecules and atoms. The ionosphereis significant because it aids long-distancecommunication by reflecting radio waves back to Earth.It is also know for its auroral displays such as the“northern lights” which develop when charged atomicparticles form the Sun are trapped by the magnetic fieldof Earth near the poles. The ionosphere particles excitethe nitrogen molecules and oxygen atoms, causing themto emit light, not unlike a neon light bulb.
  5. 5. In the northern latitudes, the effects is known as the aurora borealis (or the Northern lights), named after the Romangoddess of dawn, Aurora, and the Greek name for the north wind, Boreas, by Pierre Gassendi in 1621.
  6. 6.  Perhaps not so surprisingly, the northern lights spectacle has given rise to as many legends as there have been people watching. Symbols linked to the northern lights are found on the Sami shamanistic drum. The phenomenon has several different names in Sami. It is, for instance, known as Guovssahas, which means "the light which can be heard". The northern lights were traditionally associated with sound by the Sami, the indigenous people of Norway. And during the Viking Age, the northern lights were said to be the armour of the Valkyrie warrior virgins, shedding a strange flickering light.
  7. 7. Time when seen Frequent in late autumn and winter/early spring. Between the autumn equinox and spring equinox (21 September - 21 March), it is dark between 6 pm and 1 am, and you have maximumchances of spotting the lights. However, the weather is also of importance, and September, October andNovember tend to be wet and snowless in the north.
  8. 8. Where to see the northern lightsTheoretically, you can see the northern lights all overNorway. However, the best places are above the ArcticCircle in Northern Norway.The northern lights belt hits Northern Norway in the LofotenIslands, and follows the coast all the way up to the NorthCape. This means that no other place on earth offersbetter chances of spotting the lights, and one location inthis area might be as good as another. In fact, one oftenobserves the same northern lights in the Lofoten as inTromsø, just from a different angle. The driest weather,giving clear skies, is found inland, statistically providing thebest chances, but with strong eastern winds, the coast canbe clearer than inland areas.
  9. 9. Northern Lights Over Tysfjord, Norway