The "seahorse flare", an intense two-ribbon solar flare, erupting from active region McMath 11976 on 7 August 1972 as recorded by the Big Bear Solar Observatory (BBSO)
Geomagnetic storm
Initial onset
2 August 1972 (1972-08-02)
Dissipated
11 August 1972 (1972-08-11)
Impacts
Satellite wear and imaging errors; detonation of magnetic-influence sea mines near Haiphong, North Vietnam; localized electric grid and telephone line interruptions
Part of solar cycle 20
The solar storms of August 1972 were a historically powerful series of solar storms with intense to extreme solar flare, solar particle event, and geomagnetic storm components in early August 1972, during solar cycle 20. The storm caused widespread electric‐ and communication‐grid disturbances through large portions of North America as well as satellite disruptions. On 4 August 1972 the storm caused the accidental detonation of numerous U.S. naval mines near Haiphong, North Vietnam.[1] The coronal mass ejection (CME)'s transit time from the Sun to the Earth is the fastest ever recorded.[2]
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