Summary and Forecast

Solar Summary

(last updated 12 Mar 2026 23:30 UT)

Activity 12 Mar: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 12 Mar: 121/73

Solar Forecast

(last updated 12 Mar 2026 23:30 UT)

13 Mar 14 Mar 15 Mar Activity R0, chance R1 R0, chance R1 R0, chance R1 Fadeouts Possible Possible Possible 10.7cm/SSN 120/72 115/66 110/60 COMMENT: Solar activity on UT day 12-Mar was R0, with no solar flares. There are currently eight numbered sunspots on the solar disk. Active regions (ARs) 4191 (N05E20, beta) and 4193 (N13E35, beta) have shown slight growth, but all other sunspots are either stable or in decay. Solar activity over 13-15 Mar is expected to be R0, chance R1. No Earth-directed CMEs were observed on UT day 12-Mar. S0 solar radiation storm conditions were observed on UT day 12-Mar. S0 solar radiation storm conditions are expected over 13-15 Mar. On UT day 12-Mar the solar wind environment was mostly near background levels. The solar wind speed ranged from 400-470 km/s. The peak total interplanetary field strength (IMF, Bt) was 7 nT and the north-south IMF component range (Bz) was +7 to -6 nT. The solar wind environment is expected to be mostly at background levels on 13-Mar, before coming disturbed on 14-Mar due to a recurrent coronal hole. This disturbance is expected to continue into 15-Mar.

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