Solar activity forecast for the period April 19 - 20, 2017


Issued: 2017 April 18 17:15 UTC


Analysis from April 17/1700 UTC to April 18/1700 UTC:

Sunspot Regions on the Disk 18/1623 UTC (SDO Continuum): 2
The Largest Event: C3.3 from Region 2651 at 18/0941 UTC
X-ray background flux (1.0-8.0 A) April 17: B1.1
Radio Flux 10.7 cm at 17/2300 UTC (Penticton): 76
Solar Wind Speed at 18/1645 UTC: 314.3 km/s, Density: 7.9 p/cm^3


Forecast:
 
activity level will be low to moderate
Event probabilities: Class C: 70, Class M: 20, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A8.0 - B2.0
Radio Flux 10.7 cm: a fluctuation in the range 66 - 86

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