Solar activity forecast for the period December 22 - December 28, 2017


Activity level: mostly very low
X-ray background flux (1.0-8.0 A): in the range A3.0-A7.5
Radio flux (10.7 cm): a fluctuation in the range 66-77 f.u.
Events: class C (0/period), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-40

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


Geomagnetic activity forecast for the period December 21 - December 28, 2017

Quiet: Dec 22 - 26
Unsettled: Dec 21, 26 - 28
Active:   possible Dec 21, 27 - 28
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
The most of forected period, we expect quiet to unsettled conditions. An
isolated active event is possible next two days (December 21 - 22) and at
the end of this outlook (December 27 - 28). Between these priods when the
solar wind can be geoeffective, we expect at most quiet to unsetled
conditions. The most quiet priod is expected between December 23 - 26, the
rest time, a more unsettled character of geomagnetic field is probable.

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


Geomagnetic activity forecast for the period December 22 - January 17, 2018

Geomagnetic field will be:
quiet on December 23, 26, January 5 - 6, 11 
mostly quiet on December 22, 24, 30, January 4, 10, 15
quiet to unsettled on December 25, January 7, 17 
quiet to active on December 27 - 29, 31, January 2 - 3, 8 - 9, 12, 14, 16 
active to disturbed on January 1, 13 

Amplifications of the solar wind from coronal holes are expected
on December (24 - 28,) January 1 - 3, (6 - 8,) 10 - 13 

Remark:
- Parenthesis means lower probability of activity enhancement.

F. K. Janda, OK1HH
(from Czech Propagation Interested Group
compiling this geomagnetic activity weekly forecasts since 1978).
e-mail: ok1hh(at)rsys.cz