Solar activity forecast for the period April 20 - April 21, 2026

Issued: 2026 April 19 17:00 UTC


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

Sunspot Regions on the Disk 19/0930 UTC (SDO Continuum): 2
The Largest Event: B6.5 from Region N00E24 at 19/1446 UT
X-ray background flux (1.0-8.0 A) April 18: B2.7
Radio Flux 10.7 cm at 18/2300 UTC (Penticton): 105
Solar Wind Speed at 19/1645 UTC: 510 km/s, Density: 2.1 p/cm^3


Forecast:

activity level will be low
Event probabilities: Class C: 60, Class M: 20, Class X: 05, Proton: 01
X-ray background flux (1.0-8.0 A): in the range B2.0-B3.0
Radio Flux 10.7 cm: a fluctuation in the range 93-117

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