Solar activity forecast for the period September 8 - September 14, 2017


Activity level: mostly low to moderate
X-ray background flux (1.0-8.0 A): in the range B1.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 75-130 f.u.
Events: class C (0-12/day), class M (0-6/day), class X (0-1/period), proton (0-2/period)
Relative sunspot number (Ri): in the range 11-130

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


Geomagnetic activity forecast for the period September 8 - September 14, 2017


Quiet: Sep 11 - 12
Unsettled: Sep 10 - 13
Active:    Sep 8 - 9, 13 - 14
Minor storm: Sep 8 - 10, 14
Major storm: unlikely Sep 9
Severe storm: 0

Geomagnetic activity summary:
We expect active conditions at the both ends of the forecasted week.
Because of signicant coronal mass ejection, we expect rapid activity
enhancement at Friday, September 8, and Saturday, September 9. After this
active episode, we expect short geomagnetic activity decrease (September
11 - 13) to quiet to unsettled conditions.
The last days of forecasted period, we expect active conditions return
about September 13 - 14 before the CME effect waning.

Tomas Bayer
RWC Prague
Institute of Geophysics of the ASCR, Prague
Department of Geomagnetism
Budkov observatory (BDV)


Geomagnetic activity forecast for the period September 8 - October 4, 2017


Geomagnetic field will be: 
quiet on September 20, 24 
mostly quiet on September 11, 21 
quiet to unsettled September 12, 19, 22, 25, October 2 - 4 
quiet to active on September 10, 15, 17 - 18, 23, 26 - 27, 30, October 1 
active to disturbed on September 8 - 9, 13 - 14, 16, 28 - 29 
 
Amplifications of the solar wind from coronal holes are expected 
on September 8 - 10, 13 - 19, 27 - 28, October (1,) 2 - 4

Remark:
- Parenthesis means lower probability of activity enhancement 
and/or lower reliability of prediction. 

F. K. Janda, OK1HH 
Czech Propagation Interested Group 
OK1HH compiling weekly forecasts since January 1978 
e-mail: ok1hh(at)rsys.cz