Summary and Forecast

Solar Summary

(last updated 30 Nov 2025 23:30 UT)

Activity 30 Nov: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Nov: 180/133

Solar Forecast

(last updated 30 Nov 2025 23:30 UT)

01 Dec 02 Dec 03 Dec Activity R1-R2 R1-R2 R1-R2 Fadeouts Probable Probable Probable 10.7cm/SSN 190/143 190/143 190/143 COMMENT: Solar activity was a the R0 level over the UT day Nov-30, with no M class or higher flares observed. Currently, there are five numbered sunspot regions, with newly rotated Active Region (AR) 4294 (S16E54, beta-gamma) being the largest and most active. This region has shown mild growth over the last 24 hours, and more associated active region sites have now rotated on to the visible solar surface. AR4288 (N16W55, beta) has also shown some growth over the last UT day. Two new unnumbered regions have appeared over UT Nov-30, with a small region appearing at (S12E01), with alpha polarity. A second unnumbered region has rotated onto the solar disk at (N24E88). This region appears to exhibit foreshortening affected alpha polarity. This new active region is also coincident with previously flare active region AR4274, and has already produced two high level C-class flares over the last 24 hours as it has rotated over the disk. All other sunspot regions on the disk are either stable or in decay. Solar activity is expected to be at the R1-R2 level on 1-3 Dec, due to potential flare activity from both AR4294 and the new flare active region that has recently rotated onto the disk. Solar radiation storm conditions were at the S0 level during UT day 30-Nov, and S0 conditions are forecast to continue over the period 1-3 Dec. There were no Earth-bound Coronal Mass Ejections observed over the past UT day. The solar wind speed has gradually decreased over the past last 24 hours, dropping from 650-600 km/s, to now be largely within the range 540-580 km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 7 nT during 30-Nov, with the North-South component (Bz) ranging between -5 and +5 nT. The solar wind speed will continue to ease over 1-3 Dec, before the onset of high speed wind stream effects from an equatorial hole thereafter.

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