Three and perhaps four CMEs are heading for Earth following a series of explosions on the sun this week. Estimated time of arrival: Nov. 30th and Dec. 1st. The biggest of the CMEs, launched on Nov. 28th, could sweep up some of the earlier, lesser ones, forming a Cannibal CME capable of sparking strong G3-class geomagnetic storms with mid-latitude auroras.
Sunspot AR3500 erupted on Nov. 28th (1950 UT), producing an M9.8-class solar flare (only percentage points below category X). NASA’s Solar Dynamics Observatory recorded the blast:
