Solar activity forecast for the period September 23 - 24, 2017


Issued: 2017 September 22 17:15 UTC


Analysis from September 21/1700 UTC to September 22/1700 UTC:

Sunspot Regions on the Disk 22/1629 UTC (SDO Continuum): 1
The Largest Event: no X-ray event
X-ray background flux (1.0-8.0 A) September 21: invalid data
Radio Flux 10.7 cm at 21/2300 UTC (Penticton): 75
Solar Wind Speed at 22/1645 UTC: 359.1 km/s, Density: 8.3 p/cm^3


Forecast:
 
activity level will be low
Event probabilities: Class C: 55, Class M: 15, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A7.5 - B1.5
Radio Flux 10.7 cm: a fluctuation in the range 70-82

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