Solar activity forecast for the period May 21 - May 22, 2026

Issued: 2026 May 20 17:00 UTC


Analysis from May 19/1700 UTC to May 20/1700 UTC:

Sunspot Regions on the Disk 20/1245 UTC (SDO Continuum): 5
The Largest Event: C2.1 from Region 4436 at 19/2000 UT
X-ray background flux (1.0-8.0 A) May 19: B3.0
Radio Flux 10.7 cm at 19/2300 UTC (Penticton): 107
Solar Wind Speed at 20/1645 UTC: 455.3 km/s, Density: 1.3 p/cm^3


Forecast:

activity level will be low
Event probabilities: Class C: 85, Class M: 35, Class X: 10, Proton: 05
X-ray background flux (1.0-8.0 A): in the range B3.5-B5.0
Radio Flux 10.7 cm: a fluctuation in the range 95-119

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