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Faint ‘Red Arcs’ Spotted Over Europe

Tuesday, April 2, 2013 11:56
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Glowing red arcs invisible to the naked eye have now been detected high above most of Europe using advanced cameras pointed at the sky.

When streams of high-energy, charged particles come rushing from the sun to batter Earth, they cause what are called geomagnetic storms. These events are disruptions in the magnetosphere, the part of Earth’s atmosphere dominated by the planet’s magnetic field. The most dramatic effects of these storms are giant, bright auroras in Earth’s polar regions, but the tempests result in other striking consequences as well, such as faintly glowing red arcs high up in the ionosphere. This is the electrically charged part of Earth’s atmosphere, stretching from about 50 to 370 miles (85 to 600 kilometers) above the Earth.

The arcs give off a very specific wavelength of red light, but are too faint to see with the naked eye. They appear at lower latitudes, unlike auroras, which typically occur over higher latitudes.

[Image: red-arc.jpg1364908484]

http://news.yahoo.com/faint-red-arcs-spo…13749.html



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