The stunning nighttime display of pink and purple lights across the sky was mostly visible in the high desert and along Highway 2 in the Angeles National Forest.
For the first time since January 2005, the U.S. National Oceanic and Atmospheric Administration issued a severe geomagnetic storm watch, warning that a concentration of energy flaring from the sun could disturb Earth's electromagnetic field.
A geomagnetic storm happens when energy from solar wind is transferred into the electromagnetic field around Earth. But unusually strong bursts of energy can cause geomagnetic storms large enough to disrupt communications.
The storms also create colorful nighttime displays in the sky much farther south. Those that missed last night's performance may still be able to catch a glimpse - the storm is expected to persist through Sunday.
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