Solar activity forecast for the period September 9 - 10, 2017


Issued: 2017 September 8 17:15 UTC


Analysis from September 07/1700 UTC to September 08/1700 UTC:

Sunspot Regions on the Disk 08/1623 UTC (SDO Continuum): 5
The Largest Event: M8.1 from Region 2673 at 08/0749
X-ray background flux (1.0-8.0 A) September 7: C1.2
Radio Flux 10.7 cm at 07/2300 UTC (Penticton): 123
Solar Wind Speed at 08/1645 UTC: 720.8 km/s, Density: 1.9 p/cm^3


Forecast:
 
activity level will be moderate to very high
Event probabilities: Class C: 99, Class M: 75, Class X: 50, Proton: 99
X-ray background flux (1.0-8.0 A): in the range B8.5 - C2.5
Radio Flux 10.7 cm: a fluctuation in the range 115 - 135

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