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 - explanation
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