Solar activity forecast for the period September 19 - 20, 2017


Issued: 2017 September 18 17:15 UTC


Analysis from September 17/1700 UTC to September 18/1700 UTC:

Sunspot Regions on the Disk 18/1629 UTC (SDO Continuum): 1
The Largest Event: no X-ray event
X-ray background flux (1.0-8.0 A) September 17: invalid data
Radio Flux 10.7 cm at 17/2300 UTC (Penticton): 72
Solar Wind Speed at 18/1645 UTC: 576.7 km/s, Density: 1.9 p/cm^3


Forecast:
 
activity level will be very low
Event probabilities: Class C: 10, Class M: 01, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A3.0 - A8.0
Radio Flux 10.7 cm: a fluctuation in the range 68-78

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