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shared by Mars Base on 17 Feb 12 - No Cached

shared by Mars Base on 18 Feb 12 - No Cached

Northern Lights Display Dazzles Without Big Sun Flare
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reasons scientists can't yet explain, the northern lights blazed up in a dazzling display this week
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despite the apparent lack of a major solar flare typically associated with these celestial light shows
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began on Valentine's Day (Feb. 14),
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uptick in activity in Earth's magnetic field sparked a geomagnetic storm
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Sometimes the sky surprises us
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with little warning, geomagnetic activity rippled around the Arctic Circle
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producing an outbreak of auroras
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among the best in months
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some early speculation that a Feb. 10 sun storm, known as a coronal mass ejection (CME), may have triggered the northern lights show, but this solar outburst has not yet been confirmed.
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occur when charged particles from the sun interact with Earth's upper atmosphere
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creating ripples of glowing light
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charged particles are funneled to Earth's poles by the planet's magnetic field
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typically only visible to skywatchers in far northern or far southern latitudes
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northern lights are called the aurora borealis
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southern lights are dubbed the aurora australis
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shared by Mars Base on 20 Jan 12 - No Cached

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