New sunspot AR2778 sharply increased in size overnight, and it is now crackling with C-class solar flares.
A pulse of radiation from this flare briefly ionized the top of Earth’s atmosphere, disturbing shortwave radio propagation around the Indian Ocean: blackout map.
The sunspot has been producing similar flares every few hours since then (0615 UT on Oct. 27th).AR2778 is the biggest sunspot of young Solar Cycle 25 with nearly a dozen dark cores sprawling almost 100,000 km across the solar surface.
Mike Terry to WRTH fb group (2020-10-27)