Solar activity forecast for the period April 18 - April 19, 2026

Issued: 2026 April 17 17:00 UTC


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

Sunspot Regions on the Disk 17/1315 UTC (SDO Continuum): 3
The Largest Event: C4.2 from Region 4419 at 17/0442 UT
X-ray background flux (1.0-8.0 A) April 16: B3.2
Radio Flux 10.7 cm at 16/2300 UTC (Penticton): 109
Solar Wind Speed at 17/1645 UTC: 337 km/s, Density: 5.3 p/cm^3


Forecast:

activity level will be low
Event probabilities: Class C: 65, Class M: 25, Class X: 05, Proton: 01
X-ray background flux (1.0-8.0 A): in the range B3.0-B4.0
Radio Flux 10.7 cm: a fluctuation in the range 97-121

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