Magnetic fields on the sun’s northeastern limb erupted around 17:45 UT on April 16th, producing one of the most visually-spectacular explosions in years. NASA’s Solar Dynamics Observatory (SDO) recorded the blast at extreme ultraviolet wavelengths (above). Gas heated to nearly a million degrees was blown off the solar surface, following the twisted loops of the Sun’s invisible magnetic field lines. This happened near the limb, or edge, of the Sun; luckily this means the Earth was shielded from the bulk of the harmful radiation emitted in the event. On the other hand, it also means it’s unlikely we will see any auroral activity in the next few days as a result.