Solar activity forecast for the period September 28 - September 29, 2026

Issued: 2026 September 27 17:00 UTC


Analysis from September 26/1700 UTC to September 27/1700 UTC:

Sunspot Regions on the Disk 27/0914 UTC (SDO Continuum): 3
The Largest Event: C1.9 from Region 4536 at 27/0431 UT
X-ray background flux (1.0-8.0 A) September 26: B6.9
Radio Flux 10.7 cm at 26/2300 UTC (Penticton): 109
Solar Wind Speed at 27/1645 UTC: 0 km/s, Density: 0 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 B5.0-B9.9
Radio Flux 10.7 cm: a fluctuation in the range 99-123

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