“AR2665 is by far the biggest sunspot of 2017, stretching more than 120,000 km from end to end. Moreover, it has an unstable ‘beta-gamma’ magnetic field that harbors energy for M-class explosions. Any eruptions today would be squarely Earth-directed.
For the past 24 hours AR2665 has been strangely quiet–a sign of impotence? Or the calm before the storm? Amateur astronomers with solar telescopes are encouraged to monitor developments.”
Forecast is for sunny intervals tomorrow.