Solar activity forecast for the period April 21 - 22, 2017


Issued: 2017 April 20 17:15 UTC


Analysis from April 19/1700 UTC to April 20/1700 UTC:

Sunspot Regions on the Disk 20/1623 UTC (SDO Continuum): 3
The Largest Event: B8.0 at 20/0656 UTC
X-ray background flux (1.0-8.0 A) April 19: B1.3
Radio Flux 10.7 cm at 19/2300 UTC (Penticton): 81
Solar Wind Speed at 20/1645 UTC: 586.0 km/s, Density: 2.1 p/cm^3


Forecast:
 
activity level will be low
Event probabilities: Class C: 40, Class M: 10, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A7.5 - B2.5
Radio Flux 10.7 cm: a fluctuation in the range 71 - 91

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