Solar activity forecast for the period December 29 - December 30, 2025

Issued: 2025 December 28 17:00 UTC


Analysis from December 27/1700 UTC to December 28/1700 UTC:

Sunspot Regions on the Disk 28/1143 UTC (SDO Continuum): 12
The Largest Event: C9.9 from Region 4318 at 27/2233 UT
X-ray background flux (1.0-8.0 A) December 27: C1.6
Radio Flux 10.7 cm at 27/2300 UTC (Penticton): 176
Solar Wind Speed at 28/1645 UTC: 490 km/s, Density: 1.2 p/cm^3


Forecast:

activity level will be low to moderate
Event probabilities: Class C: 99, Class M: 65, Class X: 15, Proton: 10
X-ray background flux (1.0-8.0 A): in the range C1.5-C2.0
Radio Flux 10.7 cm: a fluctuation in the range 160-185

Katerina Drdlova
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic
e-mail: sunwatch(at)asu.cas.cz