Solar flux 183 and estimated planetary A-index 5. The estimated planetary K-index at 1800 UTC on 10 Decem

Forecast Issued at 2200Z on 09 Dec 2025

Solar Activity Forecast: Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (10 Dec, 11 Dec, 12 Dec).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one, two, and three (10 Dec, 11 Dec, 12 Dec). Protons greater than 10 Mev have a slight chance of crossing threshold on day one (10 Dec) and have a slight chance of crossing threshold on day two (11 Dec).