Solar activity forecast for the period September 1 - September 7, 2017


Activity level: mostly low
X-ray background flux (1.0-8.0 A): in the range A9.5-B5.5
Radio flux (10.7 cm): a fluctuation in the range 80-98 f.u.
Events: class C (0-7/day), class M (0-6/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 15-90

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 1 - September 7, 2017


Quiet: Sep 5 - 7
Unsettled: Sep 2 - 5
Active:    Sep 1 - 2, 4 - 5
Minor storm: Sep 1
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Beecause of large coronal hole reaching the equatorial solar latitudes, we
expect the active conditions in the two coming days. Tomorrow (Septermber
1) we expect possible storming effect but the local K-index should not
exceed value 5.
We expect unsettled to active conditions  between September 2 and
September 4. At the end of this unsettled event, active episode is
possible about September 4 because of coronal hole CIR.
Since September 5, we expect geomagnetic activity decrease to quiet to
unsettled conditions.

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


Geomagnetic activity forecast for the period September 1 - September 27, 2017


Geomagnetic field will be: 
quiet on September 10 - 11, 20 - 21 
mostly quiet on September 4 - 6, 23, 26 
quiet to unsettled September 3, 8 - 9, 19, 22, 27 
quiet to active on September 2, 7, 12, 16 - 17, 24 
active to disturbed on September 1, 13 - 15, 18, 25 
 
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