Solar activity forecast for the period September 18 - 19, 2017


Issued: 2017 September 17 17:15 UTC


Analysis from September 16/1700 UTC to September 17/1700 UTC:

Sunspot Regions on the Disk 17/1629 UTC (SDO Continuum): 2
The Largest Event: no X-ray event
X-ray background flux (1.0-8.0 A) September 16: A0.0
Radio Flux 10.7 cm at 16/2300 UTC (Penticton): 72
Solar Wind Speed at 17/1645 UTC: 617.6 km/s, Density: 2.9 p/cm^3


Forecast:
 
activity level will be very low
Event probabilities: Class C: 05, Class M: 01, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A1.5 - A7.0
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