Summary and Forecast

Solar Summary

(last updated 25 Oct 2026 23:30 UT)

Activity 25 Oct: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Oct: 89/33

Solar Forecast

(last updated 25 Oct 2026 23:30 UT)

26 Oct 27 Oct 28 Oct Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 88/32 84/26 84/26 COMMENT: Solar flare activity on UT day 25-Oct was at the R0 level, with no significant flaring activity. There is currently one numbered sunspot region visible on the disk and three unnumbered regions. Active Region (AR) 4560 (N13W78, beta) is the only numbered region on the disk and is currently rotating over the western limb. An unnumbered region recently appeared near S09W62 (beta) and has shown mild spot development. A second unnumbered region is visible near S15E63 (alpha) which has exhibited mild spot growth. A third unnumbered region near S17W28 (beta) has shown some decay. Solar flare activity is expected to be at the R0 level over 26-28 Oct. S0 solar radiation storm conditions were observed on UT day 25-Oct. S0 solar radiation storm conditions are expected over 26-28 Oct. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 25-Oct decreased, ranging between 370 and 340 km/s, and is currently near 345 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 6 nT and the north-south IMF component (Bz) ranged between -3 to +4 nT. The solar wind speed is expected to remain at background levels over 26-28 Oct.

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