In a rare event, the Sun has simultaneously released two mighty solar flares separated by 500,000 kilometers (300,000 miles).
The last 48 hours have seen remarkable behavior on the Sun, even by the standards of its last, highly active, year. Two sunspots, AR3559 and AR3561, have been filmed flaring simultaneously. The flares do not reach X-class, even together, instead having a combined value of M5.1 (halfway through the second highest energy flare class). Nevertheless, the explosive duet is a rare phenomenon and a sign of the
Rather than a coincidence, the paired explosions are an example of “sympathetic solar flares,” where magnetic loops in the solar corona trigger simultaneous explosions. Astronomers have known about sympathetic solar flares for decades, and
One of the sunspots responsible, AR3561, has been labeled as hyperactive, having released more than a dozen M-class flares within 36 hours, along with at least seven C-class flares. AR3561 looks smaller and less intensely dark than AR3559. Indeed, in still photographs it doesn’t stand out next to the nearby cluster of sunspots collectively known as AR3556. However, it has developed exceptionally fast, not having been present at the start of the week, and is accompanying that growth with flares almost every hour. Solar astronomers
Some of the flares have brought
The combined flares, the majority of whose energy came from AR3359, managed to produce moderate radio blackouts, according to
After the