Solar activity forecast for the period September 16 - 17, 2017


Issued: 2017 September 15 17:15 UTC


Analysis from September 14/1700 UTC to September 15/1700 UTC:

Sunspot Regions on the Disk 15/1623 UTC (SDO Continuum): 1
The Largest Event: no X-ray event
X-ray background flux (1.0-8.0 A) September 14: A0.0
Radio Flux 10.7 cm at 14/2300 UTC (Penticton): 74
Solar Wind Speed at 15/1645 UTC: 682.7 km/s, Density: 2.5 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 A2.5 - A7.5
Radio Flux 10.7 cm: a fluctuation in the range 69-78

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