Summary and Forecast

Solar Summary

(last updated 08 Mar 2026 23:30 UT)

Activity 08 Mar: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 08 Mar: 135/89

Solar Forecast

(last updated 08 Mar 2026 23:30 UT)

09 Mar 10 Mar 11 Mar Activity R0, chance R1 R0, chance R1 R0, chance R1 Fadeouts Possible Possible Possible 10.7cm/SSN 135/89 130/84 125/78 COMMENT: Solar activity on UT day 8-Mar was R0, with no solar flares. There are currently five numbered sunspot regions on the solar disk. Active region (AR) 4381 (N09W40, beta) has shown minor growth in its trailer spots this past day, but the main spot remains stable. All other regions are currently stable. Solar activity is expected to be R0 with a chance for R1 over 9-11 Mar. No CMEs were observed on UT day 8-Mar. S0 solar radiation storm conditions were observed on UT day 8-Mar. S0 solar radiation storm conditions are expected over 9-11 Mar. The solar wind environment on UT day 8-Mar was mildly disturbed due to recent coronal hole activity, although the influence from this coronal hole is waning. The solar wind speed ranged from 630 km/s at the start of the day to 500 km/s by the end. The peak total interplanetary field strength (IMF, Bt) was 9 nT and the north-south IMF component range (Bz) was +5 to -7 nT. The solar wind environment is expected to remain at similar levels on 9-Mar as the coronal hole effects continue to ease, but also due to a CME that is expected to pass close by the Earth. Conditions may return to background levels over 10-11 Mar.

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