Solar flux 147 and estimated planetary A-index 12. The estimated planetary K-index at 1800 UTC on 18 September was 2.00.

Forecast Issued at 2200Z on 17 Sep 2025

Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares on days one, two, and three (18 Sep, 19 Sep, 20 Sep).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (18 Sep) and quiet levels on days two and three (19 Sep, 20 Sep).