Magnetic Filaments on the Sun
With no sunspots actively flaring this weekend, solar activity is low. Or is it? There's more to solar activity than sunspots and flares. "I can't recall ever seeing as many magnetic filaments on the sun as I have this month," points out amateur astronomer John W. O'Neal of Amherst, Ohio. "This composite image is my tribute to the filament-ridden sun of May 2015."
There is an extra-large filament on the solar disk today. It stretches more than 700,000 km from end to end--about twice the distance from Earth to the moon. These dimensions make it an easy target for backyard solar telescopes. If you have one, take a look.