Solar activity forecast for the period October 21 - 22, 2017


Issued: 2017 October 20 17:15 UTC


Analysis from October 19/1700 UTC to October 20/1700 UTC:

Sunspot Regions on the Disk 20/1629 UTC (SDO Continuum): 0
The Largest Event: B3.4 at 20/1403 UTC
X-ray background flux (1.0-8.0 A) October 19: A5.3 
Radio Flux 10.7 cm at 19/2300 UTC (Penticton): 74
Solar Wind Speed at 20/1645 UTC: 386.6 km/s, Density: 5.7 p/cm^3


Forecast:
 
activity level will be very low to 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 A3.5 - 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