Summary and Forecast

Solar Summary

(last updated 12 Apr 2026 23:30 UT)

Activity 12 Apr: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 12 Apr: 99/46

Solar Forecast

(last updated 12 Apr 2026 23:30 UT)

13 Apr 14 Apr 15 Apr Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 95/41 90/34 100/48 COMMENT: Solar flare activity was at the R0 level on UT day 12-Apr, with no significant flare activity observed. The solar regions currently on the visible solar disk are relatively small. The largest of these is solar region AR4416 (N19W12, beta) which continues to grow, though has remained flare quiet. Very small new solar region AR4417 (S07W87, beta) produced some minor low level C class flares early in the UT day and is now almost off disk. Some minor spots have emerged around the larger spot of solar region AR4415 (S18E22, beta). A new small solar region appears to be rotating onto the solar disk at solar latitude N11 on the northeast solar limb. There are currently three numbered solar regions on the visible solar disk. Solar activity is expected to be at the R0 level for 13-15 Apr. S0 solar radiation storm conditions were observed on 12-Apr. S0 solar radiation storm conditions are expected over 13-15 Apr. No Earth directed coronal mass ejections (CMEs) were observed. The solar wind speed on 12-Apr was initially strong declining to moderate due to the reduced influence of coronal holes now located in the western solar hemisphere. An isolated coronal hole at solar latitude S35 is across the solar central meridian, although the latitude of this hole is likely to reduce any effects on the solar wind. A large isolated coronal hole is visible in the northeast solar quadrant. The solar wind speed ranged from 450 to 601 km/s and is currently at 450 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 6 nT and the north-south component (Bz) range was -4 and +6 nT. Solar wind 27 day recurrence patterns suggest that the solar wind speed will continue to decline to background levels during 13-14 Apr.

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