Although aurorae are usually restricted to the polar skies, fluctuations in the solar wind occasionally cause them to be visible at lower latitudes.
Aurorae are caused at heights of over 100 kilometers or 60 miles by a fast stream of charged particles from solar flares and low-density "holes" in the sun's corona.
Caused by the interaction between the solar wind, the earth's magnetic field and the upper atmosphere.
A similar effect happens in the southern hemisphere where it is known as the aurora australis.
2. "Northern lights" or colored lights in the night sky near the earth's magnetic pole in the northern hemisphere of the earth.In Roman mythology, Aurora was responsible for such duties as extinguishing stars at the end of night. She is known today primarily in the terms aurora australis, the southern lights and aurora borealis, the northern lights.
2. The most intense of the several luminous atmospheric lights appearing sometimes at night as streamers or bands of light occurring in the upper atmosphere over the middle and high latitudes and seen most often in the Artic and Antarctic regions.
It is thought to be caused by charged particles from the sun entering the earth's magnetic field and stimulating molecules in the atmosphere.
3. When capitalized, Aurora is the goddess of the dawn, the first light of day.In Roman mythology, she was the goddess of the dawn; however, in Greek her name was Eos.
Latin: Aurora (goddess)
2. The use of digital or electrical methods in radar to eliminate or reject the target signals from all targets that are outside certain range limits.