Summary and Forecast
Solar Summary
(last updated 26 Nov 2025 23:30 UT)
Activity 26 Nov: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 26 Nov: 120/72
Solar Forecast
(last updated 26 Nov 2025 23:30 UT)
27 Nov 28 Nov 29 Nov Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts None expected None expected None expected 10.7cm/SSN 120/72 125/78 125/78 COMMENT: Solar activity for UT day 26-Nov was at the R0 level, with no significant flare activity observed throughout the day. There are currently six active regions on the visible solar surface, with Active Region AR4191 (S14E17, beta-gamma) being the largest and most magnetically complex region. This region has shown some growth in the trailer spots over the last 24 hours. All other regions are either stable or in decay. Solar activity is expected to remain at the R0 level, with a chance of R1 over the period 27-29 Nov. Solar proton conditions were at the S0 level, with the 10 MeV proton flux showing a slight elevation above background after 26/1600UT, but still well within the S0 range. S0 conditions are expected to continue over 27-29 Nov. A north east directed Coronal Mass Ejections (CME) was visible over the UT day over the north east limb. This CME was considered a far side event and not geoeffective, but may indicate the presence of a strong active region rotating towards the Earth facing side of the Sun. The solar wind speed remained very strong over the past UT day due to high speed wind stream effects from an equatorial coronal hole. The solar wind speed largely ranged between 630-820 km/s over the last UT day with a general decreasing trend before increasing again from 26/1800UT, and is currently at 710km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 8 nT during 26-Nov, with the North-South component (Bz) ranging between -6 and +6 nT. The solar wind speed is forecast to remain very strong over the next 24 hours, before declining over 28-29 Nov. ACE EPAM data indicates an energetic ion enhancement event beginning 26/1010UT, which can be a precursor to increased geomagnetic activity over next 24-36 hours.
Solar Activity levels are explained in the SWS Solar Terrestrial Glossary.
