Solar activity forecast for the period May 28 - May 29, 2025

Issued: 2025 May 27 17:00 UTC


Analysis from May 26/1700 UTC to May 27/1700 UTC:

Sunspot Regions on the Disk 27/1330 UTC (SDO Continuum): 9
The Largest Event: C9.8 from Region 4098 at 26/2250 UT
X-ray background flux (1.0-8.0 A) May 26: B8.9
Radio Flux 10.7 cm at 26/2300 UTC (Penticton): 134
Solar Wind Speed at 27/1645 UTC: 444.2 km/s, Density: 16.2 p/cm^3


Forecast:

activity level will be low to moderate
Event probabilities: Class C: 99, Class M: 55, Class X: 25, Proton: 05
X-ray background flux (1.0-8.0 A): in the range B9.5-C1.5
Radio Flux 10.7 cm: a fluctuation in the range 122-146

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