Solar activity forecast for the period April 17 - April 18, 2026

Issued: 2026 April 16 17:00 UTC


Analysis from April 15/1700 UTC to April 16/1700 UTC:

Sunspot Regions on the Disk 16/1623 UTC (SDO Continuum): 3
The Largest Event: C1.7 from Region 14419 at 16/1225 UT
X-ray background flux (1.0-8.0 A) April 15: B3.2
Radio Flux 10.7 cm at 15/2300 UTC (Penticton): 105
Solar Wind Speed at 16/1645 UTC: 327.5 km/s, Density: 2.4 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 B4.0 - B4.5
Radio Flux 10.7 cm: a fluctuation in the range 102-108

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