Sunspot 1158 is growing rapidly (48 hour movie) and crackling with C-class solar flares.

© SDO/HMISunspot AR1158 is growing rapidly and poses a threat for Earth-directed C-flares.
The active region is now more than 100,000 km wide with at least a dozen Earth-sized dark cores scattered beneath its unstable magnetic canopy. Earth-directed eruptions are likely in the hours ahead.