Friday, September 30, 2011

APOD 1.5

This major solar flare sprouted from one of the most active sunspot clusters in the past few years. The flare was so large that it could be seen without a telescope. This particular flare was an X-class flare which are big, and they are major events that can trigger planet-wide radio blackouts and long-lasting radiation storms. Although another X-class flare occurred Saturday, none have been directly aimed at Earth.

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