Strong M8.1 solar flare erupts from geoeffective Region 4299, producing fast CME


A Type II Radio Emission with an estimated velocity of 1 143 km/s was associated with the event, suggesting a coronal mass ejection (CME) was produced during the event.

In addition, a 10cm Radio burst lasting 4 minutes and with a peak flux of 1 100 sfu was registered from 20:35 to 20:39 UTC. A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background.

This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers, including radar, GPS, and satellite communications.

Image credit: SWPC

Region 4299 is located in a geoeffective position, suggesting CMEs produced by it are likely to be Earth-directed.

sunspots on december 6 2025sunspots on december 6 2025
Sunspots on December 6, 2025. Credit: NASA/SDO HMI

The region has a ‘beta-delta’ magnetic configuration and is capable of producing more strong eruptions on the Sun. Earth-directed CMEs from this region are likely in the days ahead.

SWPC forecasters call for a 70% chance of M- and a 15% chance of X-class solar flares through December 8.




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