Solar activity forecast for the period May 17 - May 18, 2025

Issued: 2025 May 16 17:00 UTC


Analysis from May 15/1700 UTC to May 16/1700 UTC:

Sunspot Regions on the Disk 16/1245 UTC (SDO Continuum): 7
The Largest Event: M2.1 from Region 4087 at 15/1721 UT
X-ray background flux (1.0-8.0 A) May 15: B4.9
Radio Flux 10.7 cm at 15/2300 UTC (Penticton): 120
Solar Wind Speed at 16/1645 UTC: 419.9 km/s, Density: 5.5 p/cm^3


Forecast:

activity level will be moderate
Event probabilities: Class C: 99, Class M: 45, Class X: 15, Proton: 15
X-ray background flux (1.0-8.0 A): in the range B4.0-B5.5
Radio Flux 10.7 cm: a fluctuation in the range 108-132

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