The Northern Lights, also known as aurora borealis, may be visible in more than a dozen U.S. states Tuesday, December 9, according to the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center (NOAA).

A full-halo coronal mass ejection (CME) is expected to reach Earth early to midday on Tuesday, potentially causing periods of “strong” G3 geomagnetic storms (on a scale of G1 to G5).

The aurora borealis is the result of a geomagnetic storm that occurs when a coronal mass ejection (CME), an eruption of solar material, reaches Earth and causes swaths of purple, blue, and green in the night sky. This year’s increased solar activity (and thus, more frequent northern lights activity) is likely the result of an 11-year sun cycle peak.

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