Summary and Forecast

Solar Summary

(last updated 13 Sep 2026 23:30 UT)

Activity 13 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 13 Sep: 114/65

Solar Forecast

(last updated 13 Sep 2026 23:30 UT)

14 Sep 15 Sep 16 Sep Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 105/54 100/48 95/41 COMMENT: Solar flare activity on UT day 13-Sep was R0, with no solar flares. There are currently seven numbered sunspot regions on the solar disk, however all regions are either stable or in decay with little potential for flaring. Solar flare activity is expected to be R0 over 14-16 Sep. A filament erupted in the solar southwest near S10W10 from 19:16 UT. An associated CME was observed, however further imagery is required before an analysis can be made as to whether it will affect the Earth. S0 solar radiation storm conditions were observed on UT day 13-Sep. S0 solar radiation storm conditions are expected over 14-16 Sep. On UT day 13-Sep the solar wind environment was mostly near background levels. The solar wind speed ranged from 330 rising to near 445 km/s. The peak total interplanetary field strength (IMF, Bt) was 6 nT the north-south IMF component range (Bz) was +4 to -6 nT. The solar wind environment is expected to become enhanced on UT day 14-Sep due to connection with a coronal hole; this will be followed by a second coronal hole on 15-Sep. The solar wind will remain enhanced on 16-Sep due to ongoing effects.

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