Solar activity forecast for the period April 14 - April 20, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A4.0-B2.0
Radio flux (10.7 cm): a fluctuation in the range 60-95 f.u.
Events: class C (0-3/day), class M (0-1/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-75

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


Geomagnetic activity forecast for the period April 14 - April 20, 2017


Quiet: Apr 14 - 16
Unsettled: Apr 16 - 20
Active:   Apr 17 - 18
Minor storm: unlikely Apr 17
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
The first half of forecasted period, we expect quiet to unsettled
conditions. About the Easter Monday, April 17, an active episode is
possible. Nevertheless, we expect the Local K-index maximum at K=4,
storming episode is unlike.
The active episode can continue to April 18 - 19, then, we expect quiet to
unsettled conditions return.

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


Geomagnetic activity forecast for the period April 14 - May 9, 2017


Geomagnetic field will be:
quiet on April 16, 20 - 22, 30, May 5, 9 - 10
mostly quiet on April 14 - 15, 21, May 3 - 4, 6
quiet to unsettled April 19, 29, May 1, 2, 7, 8
quiet to active on April 23, 25 - 28
active to disturbed on April 17 - 18, 24

Amplifications of the solar wind from coronal holes are expected
on April (15,) 16 - 19, 24 - 27

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