Solar activity forecast for the period September 7 - 8, 2017


Issued: 2017 September 6 17:15 UTC


Analysis from September 05/1700 UTC to September 06/1700 UTC:

Sunspot Regions on the Disk 06/1629 UTC (SDO Continuum): 4
The Largest Event: X2.2 from Region 2673 at 06/0910 UTC
                   X9.3 from Region 2673 at 06/1202 UTC
X-ray background flux (1.0-8.0 A) September 5: C1.2
Radio Flux 10.7 cm at 05/2300 UTC (Penticton): 123
Solar Wind Speed at 06/1645 UTC: 411.3 km/s, Density: 2.6 p/cm^3


Forecast:
 
activity level will be moderate to very high
Event probabilities: Class C: 99, Class M: 75, Class X: 25, Proton: 99
X-ray background flux (1.0-8.0 A): in the range C1.0 - C5.5
Radio Flux 10.7 cm: a fluctuation in the range 120 - 160

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