Solar activity forecast for the period July 20 - July 21, 2025

Issued: 2025 July 19 17:00 UTC


Analysis from July 18/1700 UTC to July 19/1700 UTC:

Sunspot Regions on the Disk 19/1530 UTC (SDO Continuum): 10
The Largest Event: C3.3 from Region 4135 at 19/0907 UT
X-ray background flux (1.0-8.0 A) July 18: B9.3
Radio Flux 10.7 cm at 18/2300 UTC (Penticton): 156
Solar Wind Speed at 19/1645 UTC: 457.5 km/s, Density: 0.1 p/cm^3


Forecast:

activity level will be low
Event probabilities: Class C: 99, Class M: 35, Class X: 15, Proton: 05
X-ray background flux (1.0-8.0 A): in the range B9.5-C1.5
Radio Flux 10.7 cm: a fluctuation in the range 144-168

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