Solar activity has been at very low levels over the past 24 hours, with three numbered sunspot regions currently on the disk, according to the joint USAF/NOAA Solar Geophysical Activity Report and Forecast issued at 2200Z on 28 September 2026.
Forecasters expect solar activity to remain very low, with a chance for C-class flares and a slight chance for an M-class flare on days one, two, and three (29 September, 30 September, and 1 October). Event probabilities for an M-class flare were listed at 10 percent for each of the three days, while X-class and proton event probabilities were each 1 percent. The PCAF status was green.
The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 383 km/s at 27/2114Z, total IMF reached 4 nT at 28/0158Z, and the maximum southward component of Bz reached -2 nT at 28/0157Z. Electrons greater than 2 MeV at geosynchronous orbit peaked at 4128 pfu.
The geomagnetic field is expected to remain at quiet levels on days one, two, and three. The Penticton 10.7 cm flux was observed at 095 on 28 September, with predictions of 095/100/100 for 29 September through 1 October, against a 90-day mean of 120.