Timeline: The 1859 Solar Superstorm
Coronal mass ejections (CMEs) are giant bubbles of ionized gas. If Earth is caught in their crosshairs, they can induce electric currents that surge into pipelines, cables and electrical transformers. Image:
Ice cores suggest that such a blast of solar particles happens only once every 500 years, but even the storms every 50 years could fry satellites, jam radios and cause coast-to-coast blackouts.
The cost of such an event justifies more systematic solar monitoring and beefier protection for satellites and the power grid.
The authors have reconstructed what happened in 1859, based in part on similar (though less intense) events seen by modern satellites. UTC is Coordinated Universal Time—basically, Greenwich Mean Time.
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