Aurora borealis Club
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posted by shiriny
have u watched the disney movie ''brother bear''?
if yes,then u must have seen the amazing lights in the sky which in this movie they're called:where the lights touch the earth.
some people think disney has only imagined this lights but they're absolutely wrong!

All it takes is for the earth to have an atmosphere and the sun to eject ions at speeds up to 1200 km/second then BAM! You’ve got some unbelievable mother nature action. Imagine what people must have thought, thousands of years ago, when they saw these streams and swirls of light and color in the evening sky. Watching this spectacular celestial phenomena today, for that matter, is beyond spectacular.
Aurora happens in both the southern and northern hemispheres, particularly in the polar zone. It is called Aurora Borealis (also known as Northern Lights) in the Artic region and Aurora Australis in the Antartic region. Streaming plasma clouds, composed of fast moving charged particles, form a solar wind. It is the tangential interaction of the solar wind with the earth’s magnetic field that traps some of these charged particles. These trapped particles then flow along the magnetic field lines of the earth into the upper most regions of our planet’s atmosphere. That’s when the lights become manifest and their dance begins.

''aurora in other planets''

Both Jupiter and Saturn have magnetic fields much stronger than Earth's (Jupiter's equatorial field strength is 4.3 gauss, compared to 0.3 gauss for Earth), and both have large radiation belts. Aurora has been observed on both, most clearly with the Hubble Space Telescope. Uranus and Neptune have also been observed to have auroras.