Solar activity forecast for the period October 18 - October 19, 2026

Issued: 2026 October 17 17:00 UTC


Analysis from October 16/1700 UTC to October 17/1700 UTC:

Sunspot Regions on the Disk 17/1245 UTC (SDO Continuum): 7
The Largest Event: C6.0 from Region 4551 at 16/1914 UT
X-ray background flux (1.0-8.0 A) October 16: B6.0
Radio Flux 10.7 cm at 16/2300 UTC (Penticton): 130
Solar Wind Speed at 17/1645 UTC: 448.2 km/s, Density: 3.3 p/cm^3


Forecast:

activity level will be low to moderate
Event probabilities: Class C: 99, Class M: 45, Class X: 15, Proton: 10
X-ray background flux (1.0-8.0 A): in the range B5.0-B6.0
Radio Flux 10.7 cm: a fluctuation in the range 118-142

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