Summary and Forecast

Solar Summary

(last updated 13 Aug 2026 23:30 UT)

Activity 13 Aug: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 13 Aug: 108/58

Solar Forecast

(last updated 13 Aug 2026 23:30 UT)

14 Aug 15 Aug 16 Aug Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 110/60 105/54 100/48 COMMENT: Solar activity on UT day 13-Aug was at the R0 level, with no solar flares above the C-class threshold. There are currently seven numbered active regions (ARs) visible on the solar disk. ARs 4507 (N04E19, beta) and 4510 (N13W08, beta) showed some spot development over the UT day. There are no large and magnetically complex regions present on the solar disk. Solar activity over 14-16 Aug is expected to be at the R0 level. No Earth directed CMEs were observed on UT day 13-Aug. S0 solar radiation storm conditions were observed on UT day 13-Aug and are expected over 14-16 Aug. The solar wind speed was steady and near background levels on UT day 13-Aug, mostly ranging between 365 and 410 km/s. The solar wind speed is currently at around 400 km/s. The interplanetary magnetic field (IMF) strengthened slightly over the UT day, with the peak total field strength (Bt) at 8 nT and the north-south IMF component ranging between 6 and -5 nT. There is a chance of a mild increase in solar wind speed over 14-15 Aug due to high speed wind stream effects from a small coronal hole in a geoeffective position. Background solar wind conditions are expected on 16-Aug.

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