Summary and Forecast

Solar Summary

(last updated 22 Aug 2026 23:30 UT)

Activity 22 Aug: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Aug: 124/77

Solar Forecast

(last updated 22 Aug 2026 23:30 UT)

23 Aug 24 Aug 25 Aug Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 120/72 115/66 110/60 COMMENT: Solar flare activity on UT day 22-Aug was at the R0 level, with no notable flares. There are currently four numbered active regions (ARs) visible on the solar disk and one unnumbered region. AR 4513 (N04E43, beta-gamma) is the largest and most magnetically complex region on the solar disk. This region may possess a delta spot in its eastern most spots but has been flare-quiet for the past two days. All other numbered ARs are stable. An unnumbered region has developed at around N07W27, with beta magnetic classification. Solar flare activity is expected to be at R0-R1 levels over 23-25 Aug due to the magnetic complexity of 4513 and its recent flare activity. Solar radiation storm conditions were at the S0 level on 22-Aug, with the >10 MeV proton flux raised but in decline. S0 conditions are expected over 23-25 Aug, with a chance of S1 on 23-Aug due to the currently enhanced >10 MeV proton flux. The enhanced proton conditions are due to a long duration flare observed on 21-Aug. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 22-Aug decreased slightly as coronal hole high speed wind stream effects waned, ranging between 415 and 505 km/s, and is currently near 440 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 6 nT and the north-south IMF component (Bz) range was -3 to +4 nT. The solar wind speed is expected to continue to decline over 23-25 Aug as coronal hole high speed wind stream effects wane.

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