Issued: 2026 July 17 17:00 UTC


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

Sunspot Regions on the Disk 17/1623 UTC (SDO Continuum): 3
The Largest Event: C5.3 from region 4491 at 16/2135 UT
X-ray background flux (1.0-8.0 A) July 16: B3.8
Radio Flux 10.7 cm at 16/2300 UTC (Penticton): 102
Solar Wind Speed at 17/1645 UTC: 387.4 km/s, density : 0.4 p/cm^3


Forecast:

Activity level will be: low - explanation
Event probabilities: Class C: 90%, Class M: 40%, Class X: 10%, Proton: 10%
X-ray background flux (1.0-8.0 A): in the range B3.8 - B4.4
Radio Flux 10.7 cm: a fluctuation in the range 100-108

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