Our sun just had a medium-sized energy burp.
NASA's Solar Dynamics Observatory (SDO) caught a mid-level solar flare (opens in new tab) on Thursday (Jan. 20) with a peak at 1:01 a.m. EST (0601 GMT). You can see the flash on the limb, or edge, of the sun, thanks to SDO's powerful imaging.
Because the flare was on the sun's limb, it likely wasn't pointed squarely toward Earth. The solar flare is classified as medium or M5.5 class, powerful enough to potentially cause radio blackouts in polar regions if the flare were to hit our planet square-on.
SDO and several other missions keep an eye on space weather, meaning activity from the sun. Flares are often accompanied by a coronal mass ejection of charged particles that can generate auroras on Earth, but the Space Weather Prediction Center (opens in new tab) from the National Oceanic and Atmospheric Administration doesn't yet forecast any meaningful solar activity on Earth.
The sun has an 11-year cycle of solar activity, and is currently in what astronomers call Solar Cycle 25. (That number refers to the cycles that have been closely tracked by scientists.)
At the peak of solar cycles, the sun has a number of sunspots on its surface, which represent concentrations of energy. As magnetic lines tangle in the sunspots, they can "snap" and generate bursts of energy such as flares.
Solar Cycle 25's peak is a little hard to predict, but in 2020 NASA suggested we may see a peak of sunspots, solar flares and coronal mass ejections around 2025 (opens in new tab). But NASA and partner agencies do watch the sun to protect infrastructure (such as power lines) and astronauts on space missions.
"There is no bad weather, just bad preparation," Jake Bleacher, chief scientist for NASA's Human Exploration and Operations Mission Directorate, said in the 2020 agency release. "Space weather is what it is — our job is to prepare."