Issued: 2026 September 16 17:00 UTC


Analysis from September 15/1700 UTC to September 16/1700 UTC:

Sunspot Regions on the Disk 16/1300 UTC (SDO Continuum): 4
The Largest Event: B3.9 from region N07E67 at 16/1102 UT
X-ray background flux (1.0-8.0 A) September 15: B2.5
Radio Flux 10.7 cm at 15/2300 UTC (Penticton): 103
Solar Wind Speed at 16/1645 UTC: 476.0 km/s, density : 0.1 p/cm^3


Forecast:

Activity level will be: very low - explanation
Event probabilities: Class C: 40%, Class M: 05%, Class X: 01%, Proton: 01%
X-ray background flux (1.0-8.0 A): in the range B2.0-B3.0
Radio Flux 10.7 cm: a fluctuation in the range 91-115

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