Solar activity forecast for the period September 13 - September 14, 2026

Issued: 2026 September 12 17:00 UTC


Analysis from September 11/1700 UTC to September 12/1700 UTC:

Sunspot Regions on the Disk 12/1629 UTC (SDO Continuum): 9
The Largest Event: B8.5 from Region 4521 at 11/2314 UT
X-ray background flux (1.0-8.0 A) September 11: B2.7
Radio Flux 10.7 cm at 11/2300 UTC (Penticton): 110
Solar Wind Speed at 12/1645 UTC: 386.2 km/s, Density: 0.6 p/cm^3


Forecast:

activity level will be low
Event probabilities: Class C: 45, Class M: 20, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range B2.0-B4.0
Radio Flux 10.7 cm: a fluctuation in the range 100-120

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