Summary and Forecast

Solar Summary

(last updated 24 Mar 2025 23:30 UT)

Activity 24 Mar: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 24 Mar: 156/110

Solar Forecast

(last updated 24 Mar 2025 23:30 UT)

25 Mar 26 Mar 27 Mar Activity R0, chance R1 R0, chance R1 R0, chance R1 Fadeouts None expected Possible Possible 10.7cm/SSN 162/116 165/119 160/114 COMMENT: Solar activity on UT day 24-Mar was R0, with no significant solar flares. There are currently four numbered sunspot regions on the solar disk. AR4036 (N07W64, beta-gamma) has grown over the past day, however due to its location nearing the western limb analysis is restricted. All other sunspot regions are either stable or in decay. Solar activity is generally expected to be R0, with isolated R1 flares possibly from AR4036. Apart from AR4036 no regions currently have significant flare potential. S0 solar radiation storm conditions were observed on UT day 24-Mar. S0 solar radiation storm conditions are expected over 25-27 Mar. No Earth-directed CMEs were observed on UT day 24-Mar. The solar wind environment was mildly perturbed on UT day 24-Mar. The solar wind speed ranged from near 450 to 350 km/s. The peak total interplanetary field strength (IMF, Bt) was 15 nT and the north-south IMF component range (Bz) was +10 to -9 nT. Bz was oriented southward for several periods of the day. The source of the disturbance is not clear, but is not considered CME related at this stage. The solar wind environment is expected to be quiet for most of UT day 25-Mar, but a large coronal hole dominating the southern solar hemisphere may connect with the Earth over 26-27 Mar to enhance the solar wind speed.

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