Study reveals that geomagnetic storms may be stronger than previously understood, indicating new assessment methods are needed.
The severity of geomagnetic storms — magnetic disturbances in Earth’s outer atmosphere — is widely understood to reach an upper limit as the strength of the solar wind increases. But this upper limit is an illusion that results from uncertainty in the measurement of solar-wind strength as the true value regresses towards the mean. Regression to the mean explains away the apparent limit to geomagnetic disturbances linked to strong solar winds.
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A 2026 study studied this question.
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