GROWING THREAT OF FLARES: Sunspot AR1363 is growing rapidly, more than doubling in size since Friday. A 48-hour movie from NASA's SOlar Dynamic Observatory shows the expansion:

ar1363_strip2.jpg

The active region has a "beta-gamma" magnetic field that harbors energy for M-class solar flares. Because of AR1363's location near the center of the solar disk, any such eruptions in the days ahead would be Earth-directed.

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