Summary and Forecast

Solar Summary

(last updated 22 Apr 2026 23:30 UT)

Activity 22 Apr: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Apr: 116/68

Solar Forecast

(last updated 22 Apr 2026 23:30 UT)

23 Apr 24 Apr 25 Apr Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts Possible Possible Possible 10.7cm/SSN 120/72 120/72 110/60 COMMENT: Solar flare activity on UT day 22-Apr was at the R0 level, with no M-class or greater flares observed. There are currently four active regions on the visible solar disk, with Active Region (AR) 4420 (N16E37, beta-gamma) being the most magnetically complex. This region has shown growth over the past 24 hours, and has produced numerous C-class flares. The remaining three regions appear to be mostly stable or in decay. Solar flare activity is forecast to be at the R0 level, with a chance of R1 over 23-25 Apr, given the recent growth of AR 4420. S0 solar proton conditions were observed throughout UT day 22-Apr, with the proton flux persisting at background levels across the entire UT day. S0 solar proton conditions are forecast for 23-25 Apr. No Earth-directed coronal mass ejections (CMEs) were observed over the past UT day. A faint, low velocity, east-directed CME was visible from 22/0736UT, but is not geoeffective. The solar wind speed declined over 22-Apr, with speeds starting the UT day between 500-550 km/s and declining to 450-480 km/s, as past coronal hole high speed wind stream effects continued to subside. The interplanetary magnetic field strength (IMF, Bt) peaked at 6 nT, with the north-south component (Bz) ranging between -4 and +5 nT. The solar wind speed is expected to continue to decline over 23-24 Apr, with an increase expected on 25-Apr as a new coronal hole high speed wind stream connects with Earth.

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