Solar activity forecast for the period May 5 - May 11, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A4.5-B2.0
Radio flux (10.7 cm): a fluctuation in the range 60-90 f.u.
Events: class C (0-1/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-60

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 5 - May 11, 2017


Quiet: May 6 - 7, 9, 11
Unsettled: May 5, 8, 10
Active:   possible May 5, 8
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
At most, we expect quiet to unsettled condition for the whole forecaseted
period. Active episodes are possible at Friday, April 6 and Monday, April
8. Other, the local K- index should reach to value 3.

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


Geomagnetic activity forecast for the period May 5 - May 31, 2017


Geomagnetic field will be:
quiet on May 10, 14 - 15, 
mostly quiet on May 9, 13, 16, 25 - 30
quiet to unsettled May 5 - 6, 22 - 24, 31
quiet to active on May 7 - 8, 11 - 12, 19 - 21
active to disturbed on May 17 - 18

Amplifications of the solar wind from coronal holes are expected
on May (5 - 9,) 16 - 19, (20) 

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