Solar activity forecast for the period September 10 - 11, 2017


Issued: 2017 September 9 17:15 UTC


Analysis from September 08/1700 UTC to September 09/1700 UTC:

Sunspot Regions on the Disk 09/1629 UTC (SDO Continuum): 4
The Largest Event: M3.7 from Region 2673 at 09/1104 UTC
X-ray background flux (1.0-8.0 A) September 8: B8.6
Radio Flux 10.7 cm at 08/2300 UTC (Penticton): 118
Solar Wind Speed at 09/1640 UTC: 535.1 km/s, Density: 0.2 p/cm^3


Forecast:
 
activity level will be low to moderate
Event probabilities: Class C: 70, Class M: 25, Class X: 05, Proton: 50
X-ray background flux (1.0-8.0 A): in the range B6.5 - B9.5
Radio Flux 10.7 cm: a fluctuation in the range 102 - 120

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