Summary and Forecast

Solar Summary

(last updated 14 Sep 2025 23:30 UT)

Activity 14 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 14 Sep: 122/75

Solar Forecast

(last updated 14 Sep 2025 23:30 UT)

15 Sep 16 Sep 17 Sep Activity R0 chance R1 R0 chance R1 R0 chance R1 Fadeouts Possible Possible Possible 10.7cm/SSN 125/78 120/72 125/78 COMMENT: Solar activity on UT day 14-Sep was R0, with no solar flares. There are currently three numbered sunspot regions on the solar disk, which either stable or in decay. Solar activity is expected to be R0 with a chance of R1 over 15-17 Sep. No Earth-directed CMEs have been observed over the UT day. S0 solar radiation storm conditions were observed on UT day 14-Sep. S0 solar radiation storm conditions are expected over 15-17 Sep. The solar wind on UT day 14-Sep became disturbed late in the UT day from a possible weak glancing CME with connection to the coronal hole. This CME was first seen on the 11/0853 UT but initially analysed to miss the Earth. Currently the solar wind is 483 km/s. The peak total interplanetary field strength (IMF, Bt) was 15 nT and the north-south IMF component range (Bz) was +15 to -3 nT. The solar wind is expected to be enhanced over 15-17 Sep, as a large coronal hole continues to be geoeffective.

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