The Carrington Event of 1859 would be a catastrophe for the Earth if a repeat of it were to happen in the present day.
A Bad Solar Storm Could Cause an ‘Internet Apocalypse’
The undersea cables that connect much of the world would be hit especially hard by a coronal mass ejection.
https://www.wired.com/story/solar-storm-internet-apocalypse-undersea-cables/
The Carrington Event was not a one of. It will happen again.