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On the Cover Issue 45, Winter 2012

On August 1, 2010, almost the entire Earth-facing side of the sun erupted in activity from a C3-class solar flare, a solar tsunami, large-scale shaking of the solar corona, radio bursts, a coronal mass ejection, and more. This extreme ultraviolet snapshot from the Solar Dynamics Observatory (SDO) shows the sun’s northern hemisphere in mid-eruption. Different colors in the image represent different gas temperatures ranging from about 1 million to 2 million degrees kelvin.

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