Solar activity forecast for the period May 19 - May 25, 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 64-85 f.u.
Events: class C (0-2/period), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-45

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


Geomagnetic activity forecast for the period May 19 - May 25, 2017


Quiet: May 24 - 25
Unsettled: May 21 - 23
Active:   May 17 - 20
Minor storm: May 19 - 20
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
We still expect the active episode predicted to this day, i.e. Thursday,
May 18. The active conditions with possible minor storm are expected at
Friday, May 19, and, less probably, at Saturday, May 20. This day, we
expect more probably unsettled to active conditions and the active
episodes (K=4) should have isolated character only.
The last two days (May 24-25), we expect return of quiet conditions. The
rest of the forecasted period (May 21-23), we expect at most 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 May 19 - June 14, 2017


Geomagnetic field will be: 
quiet on June 1, 8 
mostly quiet on May 29, June 4, 9, 12 
quiet to unsettled May 23 - 28, June 5 - 6, 10 
quiet to active on May 21 - 22, June 3, 7, 11, 13 
active to disturbed on May 19 (- 20, 30 - 31,) June 2, 14 -> ? 
 
Amplifications of the solar wind from coronal holes are expected 
on May 19 (20 - 21, 31,) June (5 - 6,) 9 (- 14) 
 
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 1978 
e-mail: ok1hh(at)rsys.cz