Summary and Forecast

Solar Summary

(last updated 01 Aug 2026 23:31 UT)

Activity 01 Aug: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 01 Aug: 140/94

Solar Forecast

(last updated 01 Aug 2026 23:31 UT)

02 Aug 03 Aug 04 Aug Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 140/94 140/94 135/89 COMMENT: Solar flare activity on UT day 01-Aug was at the R0 level, with no significant flaring activity. There are currently six numbered regions visible on the solar disk. Active Region (AR) 4498 (N14E15, beta-gamma) is the largest and most magnetically complex region on the disk and has shown mild growth in its trailer spots over the UT day. Region 4501 (S07W24, beta) has exhibited spot growth over the 24-hour period. Newly numbered region 4502 (S07E21, beta) recently appeared on the solar disk and has shown mild spot growth. All other regions are either stable or in decay. Solar flare activity is expected to be at R0-R1 levels over 02-04 Aug, primarily due to the magnetic complexity of region 4498. S0 solar radiation storm conditions were observed on UT day 01-Aug, with the proton flux continuing to gradually decline over the UT day. S0 solar radiation storm conditions are expected over 02-04 Aug. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 01-Aug decreased, ranging between 310 and 265 km/s, and is currently near 265 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 5 nT and the north-south IMF component (Bz) range was -4 to +3 nT. The solar wind speed is expected to increase on 02-Aug due to the arrival of a CME first observed on 30-Jul, then remain elevated over 03-04 Aug.

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