Summary and Forecast

Solar Summary

(last updated 09 May 2026 23:30 UT)

Activity 09 May: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 09 May: 122/75

Solar Forecast

(last updated 09 May 2026 23:30 UT)

10 May 11 May 12 May Activity R1, chance of R2 R1, chance of R2 R1, chance of R2 Fadeouts Possible Possible Possible 10.7cm/SSN 122/75 120/72 118/70 COMMENT: Solar flare activity on UT day 09-May 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. Active Region (AR) 4432 (N12W37, beta-gamma) is the largest and most magnetically complex region on the disk. This region has exhibited spot development over the UT day. Newly numbered AR 4436 (N18E70, beta) recently rotated over the eastern limb and appears stable. All other sunspot regions are either stable or in decay. Solar flare activity is expected to be at the R1 level over 10-12 May, with a chance of R2 primarily due to the development and complexity of region 4432. S0 solar proton conditions were observed on UT day 09-May. S0 solar proton conditions are expected over 10-12 May. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 09-May decreased, ranging from 550 to 460 km/s and is currently near 460 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 6 nT and the north-south IMF component (Bz) range was -3 to +5 nT. The solar wind speed is expected to decline over 10-12 May due to waning coronal hole high speed wind stream effects.

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