Solar activity forecast for the period June 19 - June 20, 2025

Issued: 2025 June 18 17:00 UTC


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

Sunspot Regions on the Disk 18/1315 UTC (SDO Continuum): 8
The Largest Event: X1.2 from Region 4114 at 17/2149 UT
X-ray background flux (1.0-8.0 A) June 17: C1.8
Radio Flux 10.7 cm at 17/2300 UTC (Penticton): 140
Solar Wind Speed at 18/1645 UTC: 0 km/s, Density: 0 p/cm^3


Forecast:

activity level will be moderate
Event probabilities: Class C: 99, Class M: 75, Class X: 45, Proton: 15
X-ray background flux (1.0-8.0 A): in the range C1.4-C1.7
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