Solar activity forecast for the period July 16 - July 17, 2025

Issued: 2025 July 15 17:00 UTC


Analysis from July 14/1700 UTC to July 15/1700 UTC:

Sunspot Regions on the Disk 15/1641 UTC (SDO Continuum): 13
The Largest Event: C4.6 from Region 4141 at 14/1706 UT
X-ray background flux (1.0-8.0 A) July 14: C1.0
Radio Flux 10.7 cm at 14/2300 UTC (Penticton): 128
Solar Wind Speed at 15/1645 UTC: 598.1 km/s, Density: 1.2 p/cm^3


Forecast:

activity level will be low
Event probabilities: Class C: 90, Class M: 35, Class X: 05, Proton: 05
X-ray background flux (1.0-8.0 A): in the range B8.5-C1.5
Radio Flux 10.7 cm: a fluctuation in the range 115-140

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