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Big Sunspot Alert!

Sunspot AR3529 is still growing, quadrupling in size since Tuesday. This 48-hour movie from NASA's Solar Dynamics Observatory shows its rapid development:

With two primary dark cores twice the size of Earth, AR3529 is an easy target for solar filtered telescopes. You can even see it through eclipse glasses--no magnification required.

Of greater interest is the sunspot's 'delta-class' magnetic field. Within the sunspot + and - magnetic polarities are pressing together. Magnetic reconnection could produce an X-class solar flare. Any eruptions today will be Earth-directed, as the sunspot is almost directly facing Earth.


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