Summary and Forecast

Solar Summary

(last updated 21 Mar 2026 23:30 UT)

Activity 21 Mar: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 21 Mar: 107/57

Solar Forecast

(last updated 21 Mar 2026 23:30 UT)

22 Mar 23 Mar 24 Mar Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 108/58 108/58 105/54 COMMENT: Solar activity on UT day 21-Mar was R0, with no solar flares. There are currently three numbered sunspots on the solar disk, however all are either stable or in decay. Solar activity is expected to be mostly R0 over 22-24 Mar. No Earth directed CMEs were observed on UT day 21-Mar. S0 solar radiation storm conditions were observed on UT day 21-Mar. S0 solar radiation storm conditions are expected over 22-24 Mar. On UT day 21-Mar the solar wind environment was disturbed due to two CME arrivals and connection to a coronal hole. The solar wind speed ranged from 450 to 550 km/s and remains elevated. The interplanetary field strength (IMF, Bt) was 39 nT and the north-south IMF component range (Bz) was +31 to -25 nT. Several intermittent periods of southward Bz were observed towards the beginning of the day, but mostly northward Bz was observed during the strongest Bt. The solar wind speed is expected to remain elevated over 22-24 Mar as a new coronal hole is expected to connect by 23-Mar, although Bt is expected to be near nominal levels.

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