Overview
- The November 12–13 geomagnetic storm peaked at G4 and lasted 42 hours, making it the strongest event of 2025 and the second‑strongest since 2020.
- Researchers say the storm was triggered by the arrival of a coronal mass ejection, and the active solar region responsible has rotated toward the limb, limiting further Earth impact.
- By November 13, scientists had logged 61 magnetic storms this year, including four at G3 and two at G4, with the latest event nearly reaching the extreme G5 level.
- From January through October, observatories counted 134 magnetic storms and geomagnetic disturbances, underscoring unusually high activity in 2025.
- For comparison, 2024 holds the decade’s record for strong events with six G3, four G4 and one G5 storms, and Cycle 25 has seen three episodes reach G4.7 or higher, including the G5 storm of May 10–12, 2024.