Solar flux 104 and estimated planetary A-index 3. The estimated planetary K-index at 0000 UTC on 22 September was 1.33.

Forecast Issued at 2200Z on 21 Sep 2026

Solar Activity Forecast: Solar activity is likely to be low with a slight chance for an M-class flare on days one, two, and three (22 Sep, 23 Sep, 24 Sep).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (22 Sep), quiet to active levels on day two (23 Sep) and quiet to minor storm levels on day three (24 Sep).