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Sunspots

Solar Flares Coronal Mass Ejections X-class Flares Active Regions Solar Cycles Geomagnetic Storms Magnetic Fields Solar Cycle Historical Events Historical Observations AR4274 Group 4246 Sunspot Regions AR3842 Technology Impact Impact on Earth Region 4274 AR3664 Sunspot Region 4087 AR 4366 Sunspot AR 3664 Sunspot AR3664 AR4366 Earth Impacts Hyperactive Sunspot Solar Flare Classification AR4294 AR4087

Sunspot AR4366 Hurls X-Class Flares as CME Is Forecast to Brush Earth Thursday

Forecasters say the magnetically complex region remains volatile with an elevated risk of further strong flares.

NOAA Issues G2 Geomagnetic Storm Watch as Giant Sunspot Cluster Faces Earth

X1.2 Solar Flare from AR4114 Disrupts Pacific Radio Communications