Summary and Forecast

Solar Summary

(last updated 10 Aug 2026 23:30 UT)

Activity 10 Aug: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 10 Aug: 95/41

Solar Forecast

(last updated 10 Aug 2026 23:30 UT)

11 Aug 12 Aug 13 Aug Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 92/37 95/41 98/45 COMMENT: Solar flare activity on UT day 10-Aug was at the R0 level, with no significant flaring activity. There are currently three numbered regions visible on the solar disk and one unnumbered region. Active Region (AR) 4503 (S17W10, beta) is the most magnetically complex region on the disk and has exhibited mild growth over the UT day. An unnumbered region recently rotated over the eastern limb near N06E88 (alpha) and appears stable. All other regions are either stable or in decay. Solar flare activity is expected to be at the R0 level over 11-13 Aug. S0 solar radiation storm conditions were observed on UT day 10-Aug. S0 solar radiation storm conditions are expected over 11-13 Aug. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 10-Aug decreased, ranging between 455 and 360 km/s, and is currently near 360 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 7 nT and the north-south IMF component (Bz) range was -4 to +4 nT. The solar wind speed is expected to increase over 11-12 Aug due to the combined effects of high speed wind streams from multiple small coronal holes and two glancing CME arrivals.

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