Summary and Forecast

Solar Summary

(last updated 02 Aug 2026 23:30 UT)

Activity 02 Aug: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 02 Aug: 127/80

Solar Forecast

(last updated 02 Aug 2026 23:30 UT)

03 Aug 04 Aug 05 Aug Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 125/78 120/72 115/66 COMMENT: Solar flare activity on UT day 02-Aug was at the R0 level, with only C-class flares observed, the largest of which was a C6.3 at 02/0535UT from beyond the western limb. There are currently six numbered sunspot regions visible on the solar disk. Active region (AR) 4498 (N14E01, beta-gamma) remains the most magnetically complex on the disk and has exhibited growth in its trailer spots over the UT day. AR 4499 (N04W31, beta) has shown mild growth in its leader spot. All other regions are either stable or in decay. Solar flare activity is expected to be at R0-R1 levels over 03-05 Aug, primarily due to the magnetic complexity of region 4498. S0 solar radiation storm conditions were observed on UT day 02-Aug, with the proton flux continuing to gradually decline. S0 solar radiation storm conditions are expected over 03-05 Aug. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 02-Aug increased, ranging between 265 and 440 km/s, and is currently near 410 km/s. A solar wind shock was observed in the solar wind parameters at 02/1129UT, indicative of the arrival of a CME first observed on 30-Jul. The peak total interplanetary magnetic field strength (IMF, Bt) was 22 nT and the north-south IMF component (Bz) range was -17 to +12 nT. A period of sustained southward IMF conditions was observed over the interval 02/1347-1828UT. The solar wind speed is expected to remain elevated on 03-Aug, then decrease over 04-05 Aug as CME effects abate.

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