Solar activity forecast for the period September 11 - 12, 2017


Issued: 2017 September 10 17:15 UTC


Analysis from September 09/1700 UTC to September 10/1700 UTC:

Sunspot Regions on the Disk 10/1629 UTC (SDO Continuum): 3
The Largest Event: M1.1 from Region 2673 at 09/2353 UTC
X-ray background flux (1.0-8.0 A) September 9: B8.7
Radio Flux 10.7 cm at 09/2000 UTC (Penticton): 107
Solar Wind Speed at 10/1645 UTC: 467.1 km/s, Density: 0.4 p/cm^3


Forecast:
 
activity level will be low 
Event probabilities: Class C: 60, Class M: 10, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range B5.5 - C1.0
Radio Flux 10.7 cm: a fluctuation in the range 100 - 118

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