Issued: 2025 May 28 17:00 UTC


Analysis from May 27/1700 UTC to May 28/1700 UTC:

Sunspot Regions on the Disk 28/1245 UTC (SDO Continuum): 8
The Largest Event: C3.0 from region 4099 at 28/1631 UT
X-ray background flux (1.0-8.0 A) May 27: B8.8
Radio Flux 10.7 cm at 27/2300 UTC (Penticton): 140
Solar Wind Speed at 28/1645 UTC: 447.2 km/s, density : 4.0 p/cm^3


Forecast:

Activity level will be: low to moderate - explanation
Event probabilities: Class C: 99%, Class M: 45%, Class X: 15%, Proton: 05%
X-ray background flux (1.0-8.0 A): in the range B7.5-C1.1
Radio Flux 10.7 cm: a fluctuation in the range 128-152

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