For the first time, the effects of a geomagnetic superstorm on the Earth’s protective plasmasphere have been observed in detail. The storm in question compressed the plasmasphere by 80 percent, leaving us to wonder what even larger storms of the past did. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The auroras of May 10-11, 2024 , were almost certainly seen by more people than any previous space weather event in history. Not only did the massive geomagnetic storm reach lower latitudes than anything for at least 20 years, but advances in our predictive capacity , and the advent of social media, meant millions of people went outside to look. The week before, Dr Jennifer Gannon , who had done more than almost anyone to provi

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