Summary and Forecast

Solar Summary

(last updated 03 Sep 2025 23:30 UT)

Activity 03 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 03 Sep: 180/133

Solar Forecast

(last updated 03 Sep 2025 23:30 UT)

04 Sep 05 Sep 06 Sep Activity R0 to R1 R0 to R1 R0 to R1 Fadeouts Possible Possible Possible 10.7cm/SSN 180/133 178/131 175/129 COMMENT: Solar activity on UT day 03-Sep was at the R0 level, with no significant flaring activity. There are currently thirteen numbered sunspot regions visible on the solar disk. AR4197 (S18W65, beta) is the most magnetically complex region on the disk but appears stable. AR4207 (N30E28, beta) and AR4210 (N09E43, beta) are both showing growth in its intermediate spots and has also been responsible for some minor flaring. All other sunspot regions are either stable or in decay. Solar activity is expected to be at the R0-R1 level over 04-06 Sep. S0 solar proton conditions were observed on UT day 03-Sep. S0 solar proton conditions are expected over 04-06 Sep. No Earth-directed CMEs have been observed. The solar wind speed on UT day 03-Sep decreased from 540 to 449 km/s and is currently near 447 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 12 nT and the north-south IMF component (Bz) range was -5 to +3 nT. A recurrent southern hemisphere coronal hole is currently crossing the central meridian and is likely to influence the solar wind from 06-Sep.

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