Issued: 2026 May 22 17:00 UTC


Analysis from May 21/1700 UTC to May 22/1700 UTC:

Sunspot Regions on the Disk 22/1300 UTC (SDO Continuum): 9
The Largest Event: M2.4 from region 4436 at 22/1029 UT
X-ray background flux (1.0-8.0 A) May 21: B7.4
Radio Flux 10.7 cm at 21/2300 UTC (Penticton): 121
Solar Wind Speed at 22/1645 UTC: 352.4 km/s, density : 1.3 p/cm^3


Forecast:

Activity level will be: low to moderate - explanation
Event probabilities: Class C: 99%, Class M: 35%, Class X: 05%, Proton: 01%
X-ray background flux (1.0-8.0 A): in the range B6.0-C1.0
Radio Flux 10.7 cm: a fluctuation in the range 109-133

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