FARSIDE EXPLOSION: A sunspot on the farside of the sun exploded on Sept. 27th, sparking a bright flare of extreme ultraviolet radiation and hurling a massive CME into space. Although the explosion occurred on the other side of the sun, it was visible on cell phones around Earth. Here is a screenshot from NASA's 3D Sun app:
The 3D Sun is a great way to monitor events on the farside of the sun. It displays a realtime globe, which you can pinch, zoom and spin to examine explosions around the complete circumference of the star. Extreme UV images from NASA's twin STEREO probes and the Solar Dynamics Observatory (SDO) are combined to assemble the 360o view, now available on iPhones, iPads, and Android devices.
The active region could flare again.
-OneIsh Ish
