Solar activity forecast for the period September 12 - 13, 2017


Issued: 2017 September 11 17:15 UTC


Analysis from September 10/1700 UTC to September 11/1700 UTC:

Sunspot Regions on the Disk 11/1623 UTC (SDO Continuum): 2
The Largest Event: B9.8 from Region 2674 at 11/1010
X-ray background flux (1.0-8.0 A) September 10: B4.9
Radio Flux 10.7 cm at 10/2300 UTC (Penticton): 93
Solar Wind Speed at 11/1640 UTC: 290.6 km/s, Density: 1.9 p/cm^3


Forecast:
 
activity level will be low to moderate
Event probabilities: Class C: 60, Class M: 15, Class X: 01, Proton: 99
X-ray background flux (1.0-8.0 A): in the range B1.5 - B5.5
Radio Flux 10.7 cm: a fluctuation in the range 85-100

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