Solar activity forecast for the period June 22 - June 23, 2025

Issued: 2025 June 21 17:00 UTC


Analysis from June 20/1700 UTC to June 21/1700 UTC:

Sunspot Regions on the Disk 21/1529 UTC (SDO Continuum): 9
The Largest Event: M1.1 from Region 4118 at 20/1740 UT
X-ray background flux (1.0-8.0 A) June 20: B6.7
Radio Flux 10.7 cm at 20/2300 UTC (Penticton): 125
Solar Wind Speed at 21/1645 UTC: 527.7 km/s, Density: 2.7 p/cm^3


Forecast:

activity level will be low to moderate
Event probabilities: Class C: 90, Class M: 55, Class X: 20, Proton: 15
X-ray background flux (1.0-8.0 A): in the range B5.0-B7.0
Radio Flux 10.7 cm: a fluctuation in the range 110-125

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