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Moderate Geomagnetic Storm to Illuminate 20 U.S. States

4/17/2026

44 3 Full Breakdown

Summary

Story summary

A moderate geomagnetic storm (G2) is set to peak overnight on April 17, expanding aurora visibility across 20 U.S. states.
The event is driven by a co-rotating interaction region, which intensifies solar wind interactions, per the National Oceanic and Atmospheric Administration (NOAA).
Best viewing runs 10 p.m. to 2 a.m., aided by a new moon, with Alaska, Washington, Idaho, and Montana favorable; sightings may reach New York and Ohio.

History

Historical Context

The Carrington Event, occurring on September 1-2, 1859, was the most intense geomagnetic storm recorded, caused by a coronal mass ejection from the Sun. This event disrupted telegraph systems across Europe and North America, with operators experiencing electric shocks. Understanding such solar phenomena is vital today, as modern infrastructure remains vulnerable to similar storms, potentially impacting millions globally.

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Story summary

A moderate geomagnetic storm (G2) is set to peak overnight on April 17, expanding aurora visibility across 20 U.S. states.
The event is driven by a co-rotating interaction region, which intensifies solar wind interactions, per the National Oceanic and Atmospheric Administration (NOAA).
Best viewing runs 10 p.m. to 2 a.m., aided by a new moon, with Alaska, Washington, Idaho, and Montana favorable; sightings may reach New York and Ohio.

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