Solar activity forecast for the period May 22 - 23, 2017


Issued: 2017 May 21 17:15 UTC


Analysis from May 20/1700 UTC to May 21/1700 UTC:

Sunspot Regions on the Disk 21/1623 UTC (SDO Continuum): 4
The Largest Event: B1.4 at 21/0744 UTC
X-ray background flux (1.0-8.0 A) May 20: A5.0
Radio Flux 10.7 cm at 20/2300 UTC (Penticton): 72
Solar Wind Speed at 21/1645 UTC: 614.9 km/s, Density: 0.9 p/cm^3


Forecast:
 
activity level will be very low to low
Event probabilities: Class C: 15, Class M: 01, Class X: 01, Proton: 01
X-ray background flux (1.0-8.0 A): in the range A4.5 - A8.0
Radio Flux 10.7 cm: a fluctuation in the range 67 - 79

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