12/08/2025
STRONG (G3) GEOMAGNETIC STORM WATCH VALID FOR 09 DEC 2025
published: Sunday, December 07, 2025 04:42 UTC
A full-halo coronal mass ejection (CME), associated with an M8.1 flare from Region 4299 at 20:39 UTC on 06 December, is expected to impact Earth early to midday on 09 December, potentially causing periods of G3 (Strong) geomagnetic storming.
“While the connection between geomagnetic activity and human health is still an area of ongoing research, some studies suggest that the body's circadian rhythms can be influenced by geomagnetic fluctuations, potentially explaining some of the reported symptoms. With these considerations in mind, it's important for weather-sensitive individuals to be aware of increased geomagnetic activity and to observe any changes in their well-being during such times.”
https://meteostorms.com/en/wiki/g3
G3 - Strong
Once storm levels reach G3, intermittent satellite navigation and low-frequency radio navigation problems may occur, and HF radio may be intermittent, NOAA says. Voltage corrections may be needed on power systems, and false alarms may be triggered on some protection devices.
https://www.foxweather.com/earth-space/these-are-the-5-categories-that-measure-geomagnetic-storms