The particles ejected by Earth-directed CMEs typically take two or three days to reach our planet, at which point they can trigger geomagnetic storms that can disrupt radio communications, GPS signals and power grids.

The sun unleashed a powerful storm early Tuesday morning (Aug. 20), sending an enormous cloud of superheated particles rocketing toward Earth.

The solar eruption, known as a coronal mass ejection (CME), occurred at 4:24 a.m. EDT (0824 GMT) Tuesday and blasted billions of tons of solar particles toward Earth at a mind-boggling speed of 2 million mph (3.3 million km/h).

http://news.yahoo.com/sun-fires-solar-storm-directly-earth-190056298.htm...

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