Solar flux 118 and estimated planetary A-index 6. The estimated planetary K-index at 0900 UTC on 16 December was 2.00.

Forecast Issued at 2200Z on 15 Dec 2025

Solar Activity Forecast: Solar activity is expected to be low with a slight chance for an M-class flare on days one, two, and three (16 Dec, 17 Dec, 18 Dec).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (16 Dec), quiet to active levels on day two (17 Dec) and unsettled to minor storm levels on day three (18 Dec).