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


Issued: 2017 August 21 17:15 UTC


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

Sunspot Regions on the Disk 21/1641 UTC (SDO Continuum): 2
The Largest Event: C9.4 from Region 2672 at 20/1939 UTC
                   C5.9 from Region 2672 at 21/0316 UTC
X-ray background flux (1.0-8.0 A) August 20: B3.3
Radio Flux 10.7 cm at 20/2300 UTC (Penticton): 85
Solar Wind Speed at 21/1645 UTC: 570.7 km/s, Density: 2.2 p/cm^3


Forecast:
 
activity level will be low to moderate
Event probabilities: Class C: 75, Class M: 25, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A9.5 - B5.5
Radio Flux 10.7 cm: a fluctuation in the range 78 - 92

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