Summary and Forecast

Solar Summary

(last updated 09 Sep 2026 23:30 UT)

Activity 09 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 09 Sep: 109/59

Solar Forecast

(last updated 09 Sep 2026 23:30 UT)

10 Sep 11 Sep 12 Sep Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts Possible Possible Possible 10.7cm/SSN 109/59 109/59 112/63 COMMENT: Solar flare activity on UT day 09-Sep was at the R0 level, with no notable solar flares. There are currently eight numbered sunspot regions visible on the solar disk. Active regions (ARs) 4525 (N11W03, beta) and 4527 (N03E07, beta) showed small amounts of spot development over the UT day, but remain small and magnetically simple. All other regions are small, simple and either stable or in decay. R0 solar flare conditions, with a chance of R1 due to ongoing C-class flaring are expected over 10-12 Sep. S0 solar radiation storm conditions were observed on UT day 09-Sep and these conditions are expected to persist over 10-12 Sep. No Earth directed CMEs were observed on UT day 09-Sep. An east directed CME is visible in SOHO and STEREO-A coronagraph imagery from 09/1112UT. This is considered to be a far side event and not geoeffective. The solar wind speed was steady over the UT day. The wind speed mostly ranged between 385 km/s and 470 km/s and is currently at around 440 km/s. The peak total interplanetary field strength (IMF, Bt) was 10 nT and the north-south IMF component range (Bz) was +6 to -7 nT. The solar wind speed is expected to generally decline towards background levels over 10-12 Sep. A slight, temporary increase due to a small equatorial coronal hole is possible over 10-11.

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