Sunspot Alert

A big sunspot is emerging over the sun's eastern limb, posing a threat for significant solar activity. Already it has unleashed several M-class solar flares. One of the eruptions, an M3-flare on June 1st, caused a shortwave radio fadeout over Europe. Amateur astronomers with solar telescopes should keep an eye on this photogenic sunspot, while shortwave radio listeners should be alert for flare-triggered fadeouts and other propagation effects. Visit http://spaceweather.com for photos and more information.