Thursday, December 8, 2011

Aurora

Aurora, also known as the northern and southern (polar) lights or aurora (singular: aurora), featuring natural light in the sky, especially in the polar regions, and is usually celebrated at night. They usually occur in the ionosphere. They are also referred to as polar auroras. This is a misnomer, however, because they are generally seen between 65-72 degrees latitude north and south, which puts them a ring just in the Arctic and Antarctic circles. Aurora does happen more in the polar regions, but this is rare and often invisible to the naked eye.



In northern latitudes, the effect is known as the aurora Boreas, the name of the Roman goddess of the dawn, Aurora, and the Greek name for north wind, Boreas by Pierre Gassed in 1621 the aurora Boreas is also called. the northern polar lights, as only seen in the skies of the northern hemisphere, with opportunities to enhance the visibility distance to the Magnetic North Pole. (Magnetic North Pole at this time in northern Canadian Arctic archipelago.) Aurora seen near the magnetic pole may be high above his head, but from far away, they illuminate the northern horizon as a greenish glow or sometimes a faint red, as if the Sun rising from the direction are not uncommon. Aurora Boreas most often occur near the equinoxes. Northern lights had several names throughout history. The Cree call this phenomenon "Dance of the Spirit." In Europe, the Middle Ages, auroras are generally believed to be a sign from God (see Wilfried Schröder, Das Phänomen des Polarlichts, Darmstadt 1984). Its co-south, the aurora Australoid, or southern polar lights, has similar properties, but only visible from high southern latitudes in Antarctica, South America, or Australasia. Australia is the Latin word for "from the South."


Aurora can see the entire world and on other planets. They are most visible closer to the poles due to longer periods of darkness and the magnetic field.

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