You might have heard about a solar storm that was supposed to have hit Earth this past weekend, which could disrupt cellphone service, GPS devices and even the power grid.
Even though the storm, also called a “geomagnetic disturbance,” didn’t affect your power, PJM goes on alert whenever the Space Weather Prediction Center sends a solar storm warning. Late Friday, it issued such a warning, and, as is often the case, the effects of the solar activity were stronger north of the PJM footprint.
Perhaps most notably, the solar storm sparked a beautiful aurora borealis visible to many in the northern parts of the United States.
If you want to learn more about how PJM handles geomagnetic disturbances, we have a fact sheet (PDF).