X-class solar flare, February 2011

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X-class solar flare, 15th February 2011. This series of images, taken in extreme ultraviolet light by NASA's Solar Dynamics Observatory, shows the powerful eruption from the bright sunspot 1158 (upper right). Solar flares are caused by the sudden release of magnetic energy stored in the Sun's atmosphere, which can lead to a coronal mass ejection, the release of a huge number of charged particles. Flares are categorised by the energy released, with X-class flares the most powerful. When they are directed at Earth, as this one was, the massive stream of charged particles can trigger blackouts, damage satellites and cause spectacular displays of aurora.
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Credit: Science Photo Library / NASA / GSFC / SDO
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