Summary and Forecast

Solar Summary

(last updated 29 Jul 2026 23:30 UT)

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

Solar Forecast

(last updated 29 Jul 2026 23:30 UT)

30 Jul 31 Jul 01 Aug Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts None expected None expected None expected 10.7cm/SSN 144/98 140/94 135/89 COMMENT: Solar flare activity was at the R0 level on 29-Jul, with no M-class or greater flares observed. There are currently seven numbered and one unnumbered sunspot regions on the visible solar disk, with Active Region (AR) 4498 (N15E51, beta) being the largest. This region has remained stable over the past 24 hours. AR 4499 (N04E20, beta) has shown some growth over the same period. A new unnumbered region appeared at S12E18, showing significant growth and exhibiting a gamma magnetic classification. All other regions are either stable or in decay. Solar flare activity is forecast to remain at the R0 level over 30-Jul to 01-Aug, with a chance of R1 due to the high number of active regions on the disk. S0 solar radiation storm conditions were observed throughout 29-Jul, with S0 solar radiation conditions forecast over 30-Jul to 01-Aug. No Earth-directed coronal mass ejections (CMEs) were observed in available coronagraph imagery over the past UT day. The solar wind speed was light across the UT day, ranging between 350-370 km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 7 nT early in the UT day, with the north-south component (Bz) ranging between -4 and +3 nT over the UT day. The solar wind is forecast to remain mostly light over 30-Jul to 01-Aug, with a slight rise possible on 31-Jul due to a glancing impact of a CME first observed on 27-Jul.

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