Summary and Forecast

Solar Summary

(last updated 06 Sep 2026 23:32 UT)

Activity 06 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 06 Sep: 110/60

Solar Forecast

(last updated 06 Sep 2026 23:32 UT)

07 Sep 08 Sep 09 Sep Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 108/58 108/58 107/57 COMMENT: Solar activity on UT day 06-Sep was at the R0 level, with the largest flare of the day a C5.1 flare at 06/1042UT. There are currently eight numbered sunspot regions visible on the solar disk. Active region (AR) 4524 (N12E27, alpha) was responsible for the largest flare of the day and showed some development of its trailer spot. All other ARs are small, magnetically simple and either stable or in decay. Solar activity is expected to be at R0-R1 levels over 07-09 Sep, due to recent flare activity from AR 4524. Solar radiation storm conditions were at the S0 level on 06-Sep, with the >10 MeV proton flux at GOES elevated but in decline. S0 conditions with a chance of S1 are expected on 07-Sep due to currently elevated proton flux. S0 conditions are expected over 08-09 Sep. A CME associated with the C5.1 flare at 06/1042UT was observed in STEREO-A imagery from 06/1053UT, with associated eruption visible on the disk in SDO and GOES SUVI imagery from 06/1043UT at around N10E30. An absence of SOHO imagery over the relevant period makes analysing this CME difficult. Preliminary analysis suggests this CME will impact Earth on 09-Sep at 0800UT +/- 12 hours. Further analysis will be performed when more imagery is available. The solar wind speed was steady at background levels, mostly ranged between 330 and 380 km/s and is currently at around 350 km/s. The peak total interplanetary field strength (IMF, Bt) was 8 nT and the north-south IMF component range was +5 to -6 nT. An increase in solar wind speed is expected on 07-Sep due to high speed wind stream effects from an equatorial coronal hole. A further, slight, increase is expected on 08-Sep due to anticipated glancing CME impacts from CMEs first observed on 05-Sep. A larger increase is expected on 09-Sep due to the arrival of a CME first observed on 06-Sep.

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