Solar activity forecast for the period May 12 - May 18, 2017


Activity level: mostly very low
X-ray background flux (1.0-8.0 A): in the range A2.5-A9.5
Radio flux (10.7 cm): a fluctuation in the range 55-85 f.u.
Events: class C (0-3/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 12 - May 18, 2017


Quiet: May 12 - 15
Unsettled: May 16 - 18
Active:   possible May 17 - 18
Minor storm: possible May 18
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
The first half of forecasted period, we expect at most quiet (with
possible unsettled episode) conditions. The second one, the unsettled
conditions should be more frequent.
The last two days, we expect an active episode within at most unsettled
conditions with possible minor storm at the last day, i.e. May 18.

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


Geomagnetic activity forecast for the period May 12 - June 7, 2017


Geomagnetic field will be:
quiet on May 14 - 15, June 1, 
mostly quiet on May 13, June 4
quiet to unsettled May 12, 23 - 30, June 3, 5 - 7
quiet to active on May 16, 20, 21 - 22, June 2
active to disturbed on May (17 - 19, 31)

Amplifications of the solar wind from coronal holes are expected
on May 16 - 19 (and maybe about May 29 - 30 and June 3, 6, 7 - 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 1978
e-mail: ok1hh(at)rsys.cz