Solar activity forecast for the period June 18 - June 19, 2025

Issued: 2025 June 17 17:00 UTC


Analysis from June 16/1700 UTC to June 17/1700 UTC:

Sunspot Regions on the Disk 17/1430 UTC (SDO Continuum): 6
The Largest Event: C9.9 from Region S15E89 at 17/0621 UT
X-ray background flux (1.0-8.0 A) June 16: C2.4
Radio Flux 10.7 cm at 16/2300 UTC (Penticton): 147
Solar Wind Speed at 17/1645 UTC: 448.2 km/s, Density: 2.5 p/cm^3


Forecast:

activity level will be moderate
Event probabilities: Class C: 99, Class M: 55, Class X: 20, Proton: 15
X-ray background flux (1.0-8.0 A): in the range C1.0-C1.4
Radio Flux 10.7 cm: a fluctuation in the range 135-159

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