Summary and Forecast

Solar Summary

(last updated 25 Jun 2026 23:30 UT)

Activity 25 Jun: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Jun: 156/110

Solar Forecast

(last updated 25 Jun 2026 23:30 UT)

26 Jun 27 Jun 28 Jun Activity R0-R1, chance R2 R0-R1, chance R2 R0-R1, chance R2 Fadeouts Possible Possible Possible 10.7cm/SSN 155/109 155/109 155/109 COMMENT: Solar flare activity on UT day 25-Jun was R0, with no significant flaring. There are currently eight numbered sunspot regions on the solar disk. Active region (AR) 4478 (S06E61, beta-gamma-delta) is the most complex region on the disk, and while it shows high potential for activity, this region has so far been quiet and showed little change in the past day. AR 4475 (S09W01, beta) has shown some instability in its leader spot but is otherwise quiet. All other regions are either stable or in decay. Solar activity is mostly expected to be R0-R1 over 26-28 Jun, with potential for R2 activity from 4478. No Earth-directed CMEs were observed on UT day 25-Jun. S0 solar radiation storm conditions were observed on UT day 25-Jun. S0 solar radiation storm conditions are expected over 26-28 Jun. The solar wind environment on UT day 25-Jun showed signs of the early arrival of the north-south coronal hole. The solar wind speed steadily increased from 600 to 700 km/s. The peak total interplanetary field strength (IMF, Bt) was 10 nT on a slow decline, and the north-south IMF component range (Bz) was +8 to -10 nT. The solar wind speed is expected to remain enhanced over 26-27 Jun, returning to near background levels by 28-Jun.

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