On September 30, 2012 at 6:12 p.m. EDT, NASA's Advanced Composition Explorer (ACE) detected the leading edge of the Coronal Mass Ejection (CME) that had erupted from the Sun late at night on September 27. The input of energy and solar material into Earth's magnetic environment, the magnetosphere, caused what's called a geomagnetic storm – that is, compression and variation in the magnetosphere.
This storm was rated by the National Oceanic and Atmospheric Association (NOAA) as a G3 storm, on a scale from G1 to G5. Such storms are considered medium strength.
Whitehorse, Yukon, Canada
October 1, 2012
Image Credit & Copyright: Joseph Bradley
Explanation from: http://www.nasa.gov/mission_pages/sunearth/news/News092812-cme.html
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