Summary and Forecast

Solar Summary

(last updated 10 Mar 2026 23:30 UT)

Activity 10 Mar: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 10 Mar: 127/80

Solar Forecast

(last updated 10 Mar 2026 23:30 UT)

11 Mar 12 Mar 13 Mar Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts Possible Possible Possible 10.7cm/SSN 125/78 120/72 115/66 COMMENT: Solar flare activity on UT day 10-Mar was at the R0 level. A C4.7 flare observed at 10/1845UT was the largest flare of the day. There are currently five numbered sunspot regions on the solar disk. All are magnetically simple and have no recent M-class flare production history. AR4388 (S13W29, beta) and AR4389 (N13E63, beta) both showed spot development, although AR4388 showed decay in the latter half of the UT day. AR4381 (N09W65, beta) was responsible for the largest flare of the day and was in decay. An unnumbered region has developed on the solar disk at around N28E30 with beta magnetic characteristics. All other regions are currently in decay. Solar flare activity is expected to be at the R0 level with a chance of R1 over 11-13 Mar. S0 solar radiation storm conditions were observed on UT day 10-Mar. S0 solar radiation storm conditions are expected over 11-13 Mar. No geoeffective CMEs were observed on UT day 10-Mar. A narrow, northwest directed CME is visible in SOHO and STEREO-A imagery from 10/1101UT. This CME is not considered geoeffective. The solar wind speed increased over the UT day 10-Mar, mostly ranging between 390 and 530 km/s. The wind speed is currently at around 505 km/s. The peak total interplanetary field strength (IMF, Bt) was 9 nT and the north-south IMF component range (Bz) was +6 to -8 nT. The solar wind speed is expected to remain at around current levels on 11-Mar, with a decline likely over 12-13 Mar.

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