Solar activity forecast for the period September 20 - 21, 2017


Issued: 2017 September 19 17:15 UTC


Analysis from September 18/1700 UTC to September 19/1700 UTC:

Sunspot Regions on the Disk 19/1629 UTC (SDO Continuum): 1
The Largest Event: no X-ray event
X-ray background flux (1.0-8.0 A) September 18: invalid data
Radio Flux 10.7 cm at 18/2300 UTC (Penticton): 71
Solar Wind Speed at 19/1645 UTC: 486.1 km/s, Density: 1.1 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 A4.5 - A9.5
Radio Flux 10.7 cm: a fluctuation in the range 67-78

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