Solar activity forecast for the period July 21 - July 27, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A4.0-B1.5
Radio flux (10.7 cm): a fluctuation in the range 67-85 f.u.
Events: class C (0-5/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 July 21 - July 27, 2017


Quiet: Jul 21, 25 - 27
Unsettled: Jul 22 - 25
Active:    possible Jul 21 - 23
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
After the last active episode (July 16, with six repetitions of K=4 at the
Budkov observatory) we expect at most quiet to unsettled conditions. The
quiet course can be interrupted during the coming weekend when we expect
more unsettled conditions with possible active episode, too.

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


Geomagnetic activity forecast for the period July 21 - August 10, 2017


Geomagnetic field will be: 
quiet on July 25 -26, August 1 - 2 
mostly quiet on July 24, 27, 30 - 31, August 4, 8 
quiet to unsettled July 23, August 3 
quiet to active on July 21 - 22, 28 - 29, August 7 
active to disturbed on August 5 - 6 
 
Amplifications of the solar wind from coronal holes are expected 
on July 21, (23 - 24, 28 - 29), August 6 - 8
 
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