Solar activity has been at low levels over the past 24 hours, with four numbered sunspot regions currently on the disk, according to the joint USAF/NOAA Solar Geophysical Activity Report and Forecast issued at 2200Z on 27 September 2026.
Solar activity is likely to remain low with a slight chance for an M-class flare on day one, 28 September, and is expected to be very low with a chance for C-class flares on days two and three, 29 and 30 September. Event probabilities for 28-30 September put the chance of an M-class flare at 10/05/05 percent and an X-class flare at 01/01/01 percent, with proton events also at 01/01/01 percent and PCAF at green.
The geomagnetic field was at quiet to active levels over the past 24 hours. Solar wind speed peaked at 477 km/s at 26/2142Z, total IMF reached 5 nT at 26/2103Z, and the maximum southward component of Bz reached -4 nT at 27/0618Z. Electrons greater than 2 MeV at geosynchronous orbit peaked at 3060 pfu.
The geomagnetic field is expected to be at quiet levels on all three days, 28, 29 and 30 September. Observed Afr/Ap for 26 September was 011/013, with 010/010 estimated for 27 September and 006/005 predicted for each of the following three days.
The Penticton 10.7 cm flux was observed at 097 on 27 September, with predictions of 098/100/105 for 28-30 September and a 90-day mean of 121.