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Powerful Gannon Superstorm Disrupts Earth's Plasmasphere, Causes Auroras

11/26/2025

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Summary

Story summary

On May 10–11, 2024, the Gannon geomagnetic superstorm struck Earth, strongest in over 20 years.
Data from Japan's Arase satellite showed the plasmasphere contracting to one-fifth of its size.
The contraction persisted and recovered slowly, taking more than four days due to a "negative storm" that caused auroras in Japan and Mexico.
Nagoya University published these findings to advance understanding of space weather impacts on technology and communication systems.

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Story summary

On May 10–11, 2024, the Gannon geomagnetic superstorm struck Earth, strongest in over 20 years.
Data from Japan's Arase satellite showed the plasmasphere contracting to one-fifth of its size.
The contraction persisted and recovered slowly, taking more than four days due to a "negative storm" that caused auroras in Japan and Mexico.
Nagoya University published these findings to advance understanding of space weather impacts on technology and communication systems.