A severe geomagnetic storm could disrupt communications and bring northern lights to parts of California, according to a warning from the National Oceanic and Atmospheric Administration.

COMMUNICATIONS Solar BombardmentOn Easter Sunday, telegraph wires hummed with holiday messages. Suddenly something went blooey. Teletype messages began to arrive in jumbles like pied type. Short ...

Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth’s atmosphere to physically affect humans on the ground, NASA claims. However, when intense ...