Solar activity forecast for the period September 8 - 9, 2017


Issued: 2017 September 7 17:15 UTC


Analysis from September 06/1700 UTC to September 07/1700 UTC:

Sunspot Regions on the Disk 07/1629 UTC (SDO Continuum): 4
The Largest Event: M7.3 from Region 2673 at 07/1015 UTC
                   X1.3 from Region 2673 at 07/1436 UTC
X-ray background flux (1.0-8.0 A) September 6: C1.9
Radio Flux 10.7 cm at 06/2300 UTC (Penticton): 127
Solar Wind Speed at 07/1645 UTC: 479.7 km/s, Density: 1.6 p/cm^3


Forecast:
 
activity level will be low to high
Event probabilities: Class C: 99, Class M: 75, Class X: 25, Proton: 85
X-ray background flux (1.0-8.0 A): in the range C1.0 - C4.0
Radio Flux 10.7 cm: a fluctuation in the range 120 - 150

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