The Carrington Event was the most intense geomagnetic storm in recorded history. It was associated with a very bright solar flare and it created strong auroral displays that were reported globally and caused sparking and even fires in multiple telegraph stations. The geomagnetic storm was most likely the result of a coronal mass ejection (CME) from the Sun colliding with Earth's magnetosphere.
A geomagnetic storm of this magnitude occurring today would cause widespread electrical disruptions, blackouts, and could cause an internet apocalypse, sending large numbers of people and businesses offline due to extended outages of the electrical power grid. More
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