A "severe" G4-scale geomagnetic storm hit Earth this morning following a series of powerful solar eruptions, the National Oceanic and Atmospheric Administration (NOAA) announced. The storm has since subsided — but bright auroras could still be visible in more than a dozen states near the U.S.-Canada border as mild geomagnetic activity continues to crackle through the atmosphere.
G4-scale storms like the one detected this morning can have adverse effects on satellites, power grids and radio communication systems, NOAA added. Fortunately, most of these impacts are mitigable with advanced warning.
