Summary and Forecast

Solar Summary

(last updated 29 Apr 2026 23:31 UT)

Activity 29 Apr: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 29 Apr: 143/97

Solar Forecast

(last updated 29 Apr 2026 23:31 UT)

30 Apr 01 May 02 May Activity R1, chance of R2 R1, chance of R2 R1, chance of R2 Fadeouts Possible Possible Possible 10.7cm/SSN 140/94 135/89 132/86 COMMENT: Solar flare activity on UT day 29-Apr was at the R0 level, with several low level C-class flares observed. There are currently five numbered sunspot regions visible on the solar disk and one unnumbered region. Active Region (AR) 4420 (N16W54, beta-gamma-delta) is the most magnetically complex region on the disk. This region has shown mild decay and redistribution of its leader and intermediate spots. AR 4424 (N17W19, beta-gamma) has exhibited mild growth in its intermediate spots. Regions 4423 (S07W30, beta) and 4428 (S23E04, beta) have shown spot growth over the UT day. An unnumbered region recently appeared on the solar disk near S06E50 (alpha) and is stable. All other sunspot regions are either stable or in decay. Solar flare activity is expected to be at the R1 level over 30-Apr to 02-May, with a chance of R2 due to the complexity of regions 4420 and 4424. S0 solar proton conditions were observed on UT day 29-Apr. S0 solar proton conditions are expected over 30-Apr to 02-May. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 29-Apr mildly declined, ranging from 345 to 310 km/s and is currently near 320 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 8 nT and the north-south IMF component (Bz) range was -4 to +5 nT. The solar wind speed is expected to mildly increase on 30-Apr due to a small southern hemisphere coronal hole, then ease on 01-May. A northern hemisphere coronal hole is currently crossing the central meridian and may influence the solar wind speed on 02-May.

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