Geomagnetic storms caused by solar wind might be more extreme than previously thought

TL;DR - Measurement uncertainty might create the illusion that geomagnetic-storm severity plateaus as solar-wind strength rises. Correcting this statistical bias could imply more extreme storms than previously estimated.

• Solar-wind measurement errors can cause true values to regress toward the mean.
• This bias can produce an apparent upper limit on geomagnetic-storm severity.
• Risk models based on that presumed limit might underestimate extreme space-weather events.