Massive Sunspot AR1339.
"Big sunspot AR1339 (described below) unleashed an X2-class solar flare on Nov. 3rd at 2027 UT. A movie from the Solar Dynamics Observatory shows the extreme ultaviolet flash. The flare created waves of ionization in Earth's upper atmosphere, altering the normal progagation of radio waves over Europe and the Americas."
"NOAA forecasters have upgraded the chance of X-class solar flares today to 20%. The source would be AR1339, one of the biggest sunspots in many years. The active region rotated over the sun's eastern limb two days ago and now it is turning toward Earth.
The sunspot has already unleashed one X-flare on Nov. 3rd around 2027 UT. A movie from NASA's Solar Dynamics Observatory shows the extreme ultraviolet flash:
The flare created waves of ionization in Earth's upper atmosphere, altering the normal propagation of radio waves over Europe and the Americas. In Ireland, the flare's effect was felt even after dark.
A cloud of plasma or "CME" raced away from the blast site at 1100 km/s. The CME is not heading for Earth. It is, however, heading for Mercury and Venus. Click on this link to view a movie of the CME's forecast track."
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