Story perspectives

Geomagnetic Storm Warning: Solar Activity Set to Rise!

9/20/2025

43 3

Summary

Story summary

A G1-class geomagnetic storm may occur on September 22 due to the "Russell-McPherron effect," which enhances solar wind disturbances during equinoxes.
Sunspot 4220 features a unique ring-shaped structure with a hot core, suggesting potential explosive activity.
Solar activity is currently low, with only C-class flares detected, but isolated M-class flares could occur until September 20.
A large butterfly-shaped coronal hole on the Sun is likely to affect solar wind conditions, increasing activity in the coming weeks.
The geomagnetic field is expected to remain quiet on September 20, shifting to quiet to active levels on September 21.

History

Historical Context

The Carrington Event of 1859 was the most intense geomagnetic storm recorded, disrupting global telegraph systems and causing fires. This event highlighted the vulnerability of technology to solar activity. Today, a predicted G1-class storm, influenced by the Russell-McPherron effect, underscores the ongoing need for monitoring solar phenomena to protect modern infrastructure, including satellites and power grids.

1 of 2

Story summary

A G1-class geomagnetic storm may occur on September 22 due to the "Russell-McPherron effect," which enhances solar wind disturbances during equinoxes.
Sunspot 4220 features a unique ring-shaped structure with a hot core, suggesting potential explosive activity.
Solar activity is currently low, with only C-class flares detected, but isolated M-class flares could occur until September 20.
A large butterfly-shaped coronal hole on the Sun is likely to affect solar wind conditions, increasing activity in the coming weeks.
The geomagnetic field is expected to remain quiet on September 20, shifting to quiet to active levels on September 21.

1 / 2