Solar activity forecast for the period August 4 - August 10, 2017


Activity level: mostly very low
X-ray background flux (1.0-8.0 A): in the range A3.0-A9.5
Radio flux (10.7 cm): a fluctuation in the range 66-80 f.u.
Events: class C (0-4/period), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-45

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


Geomagnetic activity forecast for the period August 3 - August 10, 2017


Quiet: Aug 3 - 4, 9 - 10
Unsettled: Aug 4 - 6, 7 - 8
Active:    Aug 4 - 6
Minor storm: possible Aug 5
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Currently, local geomagnetic field is quiet.
We expect the nearest active episode during this weekend peaking at the
Saturday, August 5. Because of the positively charged large coronal hole,
minor storming effect is possible about this day, too. Since Sunday,
August 6, we expect geomagnetic activity decrease to quiet to unsettled
level again.

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



Geomagnetic activity forecast for the period August 4 - August 30, 2017


Geomagnetic field will be: 
quiet on August 8 - 10, 15, 25 - 26, 29 - 30 
mostly quiet on August 11, 16, 27 
quiet to unsettled August 7, 14, 21, 23 - 24, 28 
quiet to active on August 6, 12 - 13, 17 - 20, 22 
active to disturbed on August 4 - 5 
 
Amplifications of the solar wind from coronal holes are expected 
on August 5 - 9, 14 - 23, (28)
 
Remarks:
- Parenthesis means lower probability of activity enhancement 
and/or lower reliability of prediction. 
- A further Geomagnetic activity forecast will be issued on 
a regular basis August 10th, but the overnext will be compiled 
on August 31, because of the author's participation on the expedition. 
Contrary to the ancient times when our publishing began, there 
are other relatively reliable and usable resources today. 

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