Solar activity forecast for the period April 22 - 23, 2017


Issued: 2017 April 21 17:15 UTC


Analysis from April 20/1700 UTC to April 21/1700 UTC:

Sunspot Regions on the Disk 21/1623 UTC (SDO Continuum): 3
The Largest Event: B6.2 at 21/1216 UTC
X-ray background flux (1.0-8.0 A) April 20: B1.1
Radio Flux 10.7 cm at 20/2300 UTC (Penticton): 83
Solar Wind Speed at 21/1645 UTC: 562.6 km/s, Density: 3.4 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 73 - 93

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