Solar activity forecast for the period September 6 - 7, 2017


Issued: 2017 September 5 17:15 UTC


Analysis from September 04/1700 UTC to September 05/1700 UTC:

Sunspot Regions on the Disk 05/1629 UTC (SDO Continuum): 5
The Largest Event: M5.5 from Region 2673 at 04/2033 UTC
                   M4.2 from Region 2673 at 05/0108 UTC
                   M3.2 from Region 2673 at 05/0453 UTC
                   M3.8 at 05/0640 UTC
X-ray background flux (1.0-8.0 A) September 4: C1.6
Radio Flux 10.7 cm at 04/2300 UTC (Penticton): 145
Solar Wind Speed at 05/1645 UTC: 502.3 km/s, Density: 2.6 p/cm^3


Forecast:
 
activity level will be low to high
Event probabilities: Class C: 99, Class M: 70, Class X: 15, Proton: 90
X-ray background flux (1.0-8.0 A): in the range B9.0 - C3.5
Radio Flux 10.7 cm: a fluctuation in the range 130 - 160

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