Solar activity forecast for the period April 28 - May 4, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A5.0-B2.5
Radio flux (10.7 cm): a fluctuation in the range 60-95 f.u.
Events: class C (0-2/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 28 - May 4, 2017


Quiet: Apr 29 - 30
Unsettled: Apr 28 - 29, May 3 - 4
Active:   May 1 - 2
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Till the end of the April, we expect quiet to unsettled conditions
hand-to-hand to the current solar wind velocity decrease. At the start of
May, most probably May 1-2, we expect an active episode. The local K-index
should reach K = 4, we do not expect any storming effect.
After the active episode, we expect quiet to unsettled conditions return
(at most unsettled with quiet intermissions) to the end of forecasted
period.

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


Geomagnetic activity forecast for the period April 28 - May 24, 2017


Geomagnetic field will be:
quiet on May 9 - 10, 12 - 13
mostly quiet on April 30, May 7
quiet to unsettled April 29, May 2, 4, 14, 21 - 24
quiet to active on April 28, May 1, 3, 8, 11, 15 - 16, 19
active to disturbed on May (5 - 6,) 17 - 18, 20 

Amplifications of the solar wind from coronal holes are expected
on April 28, May (1 - 5,) 6 - 8, (9 - 11,) 18 - 22

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