Solar activity forecast for the period May 19 - May 20, 2026

Issued: 2026 May 18 17:00 UTC


Analysis from May 17/1700 UTC to May 18/1700 UTC:

Sunspot Regions on the Disk 18/1500 UTC (SDO Continuum): 6
The Largest Event: C9.7 from Region 4436 at 17/2053 UT
X-ray background flux (1.0-8.0 A) May 17: B4.3
Radio Flux 10.7 cm at 17/2300 UTC (Penticton): 106
Solar Wind Speed at 18/1645 UTC: 514.3 km/s, Density: 2.2 p/cm^3


Forecast:

activity level will be low to moderate
Event probabilities: Class C: 95, Class M: 35, Class X: 10, Proton: 05
X-ray background flux (1.0-8.0 A): in the range B3.0-B4.0
Radio Flux 10.7 cm: a fluctuation in the range 94-118

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