The monster sunspot group AR 1476 (upper left) measures more than 60,000 miles from end to end. NASA’s Solar Dynamics Observatory spacecraft snapped this photo on May 7, 2012. Click to enlarge this image.
An enormous sunspot group has taken shape on the surface of the sun, hinting that our star may soon start spouting off some powerful storms.
The huge sunspot complex, known as AR 1476, rotated into Earth’s view over the weekend. It measures more than 60,000 miles (100,000 kilometers) across, researchers said. Scientists with NASA’s Solar Dynamics Observatory mission, a space-based telescope watching the sun, dubbed the solar structure a “monster sunspot” in a Twitter announcement.
AR 1476 is big enough for amateur astronomers with decent equipment to spot from their backyards, weather permitting. (Warning: Never look at the sun directly with telescopes or the unaided eye. Special filters are required for safe solar viewing to avoid serious eye damage.)
“With at least four dark cores larger than Earth, AR 1476 sprawls more than 100,000 km from end to end, and makes an easy target for backyard solar telescopes,” the website Spaceweather.com reported Monday (May 7).
Sunspots are temporary dark patches on the surface of the sun that are caused by intense magnetic activity. These structures sometimes erupt into solar flares, which send high-energy radiation streaming into space.
Solar physicists classify flares into three main categories: C, M and X, with C being the least powerful and X the strongest. X-class flares can cause long-lasting radiation storms in Earth’s upper atmosphere and trigger radio blackouts. M-class flares can cause brief radio blackouts in the polar regions and occasional minor radiation storms, while C flares have few noticeable consequences.
AR 1476 has already proven quite active, firing off a number of C flares over the past few days. And another sunspot group, AR 1471, erupted Monday evening with one that seems to be an M1, one of the least powerful M flares, according to Spaceweather.com.