Solar activity forecast for the period September 15 - September 16, 2026

Issued: 2026 September 14 17:00 UTC


Analysis from September 13/1700 UTC to September 14/1700 UTC:

Sunspot Regions on the Disk 14/1500 UTC (SDO Continuum): 5
The Largest Event: C1.4 from Region S14W07 at 13/1945 UT
X-ray background flux (1.0-8.0 A) September 13: B3.1
Radio Flux 10.7 cm at 13/2300 UTC (Penticton): 109
Solar Wind Speed at 14/1645 UTC: 366.2 km/s, Density: 3.6 p/cm^3


Forecast:

activity level will be very low to low
Event probabilities: Class C: 45, Class M: 10, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range B2.5-B3.5
Radio Flux 10.7 cm: a fluctuation in the range 97-121

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