gruppo di macchie solari grandi 12 volte come la terra sono a rischio flare potenti.
BIG SUNSPOT BOOSTS ODDS FOR FLARES: The rapid growth of sunspot AR1726 continues. Invisible only two days ago, it is now a behemoth more than 150,000 km (a dozen Earth diameters) wide. A 48-hour movie from the Solar Dynamics Observatory shows the active region's development (click to play):
The sunspot has a 'beta-gamma' magnetic field that harbors energy for M-class flares. NOAA forecasters put the odds of an M-class eruption today at 10%, but that is probably an underestimate. AR1726 poses a growing threat for significant Earth-directed flares. Solar flare alerts
gianni maltoni
SOCIO C.U.N. romagna
