Summary and Forecast

Solar Summary

(last updated 03 Sep 2026 23:30 UT)

Activity 03 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 03 Sep: 108/58

Solar Forecast

(last updated 03 Sep 2026 23:30 UT)

04 Sep 05 Sep 06 Sep Activity R0-R2 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 115/66 115/66 110/60 COMMENT: Solar activity on UT day 3-Sep was R0, with no significant solar flares. There are currently six numbered sunspot regions, although many have decayed into plague. The remaining spots are all stable. Solar activity is expected to be R0-R1 over 4-6 Sep. Several CMEs were observed on UT day 3-Sep, and while none are considered geoeffective available imagery is currently limited. S0 solar radiation storm conditions on UT day 3-Sep were S0. S0 solar radiation storm conditions are expected over 4-6 Sep. The solar wind environment on UT day 3-Sep was mostly near background levels. The anticipated CME from 31-Aug may have arrived, but no signature in the solar wind is visible. The solar wind speed was mostly steady near 400 km/s over the day. The peak total interplanetary field strength (IMF, Bt) was 9 nT and the north-south IMF component range was +6 to -4 nT. The solar wind environment is expected to be mostly at background levels over 4-6 Sep, although brief enhancements are possible due to several small and fragmented coronal holes near geoeffective locations.

Solar Activity levels are explained in the SWS Solar Terrestrial Glossary.