Solar flux 150 and estimated planetary A-index 6. The estimated planetary K-index at 0300 UTC on 19 September was 0.67.

Forecast Issued at 2200Z on 18 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 (19 Sep, 20 Sep, 21 Sep).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (19 Sep, 20 Sep) and quiet to active levels on day three (21 Sep).