Solar activity forecast for the period December 29 - January 4, 2018


Activity level: mostly very low
X-ray background flux (1.0-8.0 A): in the range A2.5-A6.5
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 0-35

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 29 - January 4, 2018

Quiet: Dec 29 - 30, Jan 4
Unsettled: Dec 30  - 31, Jan 2 - 3
Active:   Dec 31  - Jan 2
Minor storm: Dec 31 - Jan 1
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Till the New Year's Eve, we expect quiet to unsettled conditions. The main
active episode may start at the New Year's Eve, and peak at Januar 1,
2018. After this active episode which may reach minor storm level, we
expect unsettled conditions return (January 2-3) and, finally, geomagnetic
activity decrease to quiet to unsettled level (January 4).

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



Geomagnetic activity forecast for the period December 29 - January 24, 2018

Geomagnetic field will be:
quiet on December 30, January 5, 11, 17 - 18, 23 - 24
mostly quiet on December 29, January 4, 6, 19, 
quiet to unsettled on January 7 - 8, 10, 16, 
quiet to active on December 31, January 2 - 3, 12, 14 - 15, 22 
active to disturbed on January 1, 9, (13, 20 - 21) 

Amplifications of the solar wind from coronal holes are expected
on December January 1 - 3, (6 - 8,) 10 - 13, 19 - 20, (21 - 22) 

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