A solar flare erupts from the sun in October 2014. (Credit: NASA/SDO)

A 1972 solar storm triggered a Vietnam War mystery

On Aug. 4, 1972, U.S. military pilots flying south of Haiphong harbor in North Vietnam saw something unexpected: more than two dozen sea mines suddenly—and without apparent explanation—exploding in the water. Now, CU Boulder engineering professor Delores Knipp and her colleagues have dug into this four-decades-old naval mystery. In a...
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