Summary and Forecast

Solar Summary

(last updated 03 May 2026 23:30 UT)

Activity 03 May: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 03 May: 143/97

Solar Forecast

(last updated 03 May 2026 23:30 UT)

04 May 05 May 06 May Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts None expected None expected None expected 10.7cm/SSN 140/94 140/94 135/89 COMMENT: Solar flare activity was at the R0 level on UT day 03-May, with only low-level C-class flares observed. There are currently nine active sunspot regions on the visible solar disk, with Active Region (AR) 4428 (S23W51, beta) being the largest. This region has shown some decay over the last 24 hours. AR 4429 (S05W04, beta) has shown some growth in minor spots over the same period. A new region has recently rotated over the eastern limb at N22E88, with a magnetic classification dominated by limb foreshortening. All other regions on the disk are either stable or in decay. Solar flare activity over 04-06 May is forecast to be at the R0 level, with a chance of R1, given the number of solar regions currently on the disk. S0 solar proton conditions were observed over UT day 03-May. S0 solar proton conditions are expected over 04-06 May. No Earth-directed coronal mass ejections (CMEs) were observed over the past 24 hours in available coronagraph imagery. No CME was visible from the filament eruption first observed on 02/1816UT. The solar wind was broadly constant for much of 03-May, ranging between 400 and 440 km/s across most of the UT day, and declining to between 380 and 400 km/s over the past three hours. The interplanetary magnetic field strength (IMF, Bt) peaked at 6 nT, with the north-south component (Bz) ranging between -6 and +4 nT over the UT day. The solar wind is expected to continue to trend towards background values over 04-06 May.

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