You're looking at the largest sunspot since 1990 as it crossed the surface of the Sun. Captured between October 17th and 29th, the spot was big enough to see without a telescope.
Despite its size and production of lots of flares, it "did not produce any significant coronal mass ejections (CME)", according to Alex Young a solar scientist at NASA's Goddard Space Flight Center. A CME is a huge solar flare that sends out massive amounts of electromagnetic radiation, which could potentially effect Earth's magnetosphere. [NASA]