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  Weekly Space Weather Highlights
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Highlights of Solar and Geomagnetic Activity
04 - 10 December 2017

Solar activity was at very low levels. Regions 2690 (N07, L=332,
class/area Bxo/010 on 06 Dec) and 2691 (S03, L=221, class/area
Axx/010 on 10 dec) were both relatively quiet and stable throughout
the period. No Earth-directed CMEs were observed. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
moderate levels on 04-05 Dec and increased to high levels on 06-10
Dec following CH HSS influence. 

Geomagnetic field activity was at quiet to active levels on 04-06
Dec with G1 (Minor) storm conditions observed on 05 Dec due to
influence from a positive polarity CH HSS. Quiet to unsettled
conditions were observed on 07 Dec as CH HSS effects waned. Quiet
conditions prevailed for the remainder of the period. 

Forecast of Solar and Geomagnetic Activity
11 December - 06 January 2018

Solar activity is expected to be at very low levels throughout the
period. 

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 11 Dec, 13-17 Dec, 19-21 Dec and
02-06 Jan following recurrent CH HSS events. Normal to moderate
levels are expected at all other times during the period. 

Geomagnetic field activity is expected to be at quiet to active
levels on 11-13 Dec, decreasing to quiet to unsettled levels on 14
Dec due to positive polarity CH HSS effects. Quiet conditions are
expected on 15-16 Dec. Unsettled to active conditions are expected
on 17-21 Dec, with G1 (Minor) storm levels on 18 Dec due to
recurrent positive polarity CH HSS influence. Quiet conditions are
anticipated from 22-26 Dec, followed by unsettled to active levels
on 27-28 Dec due to negative polarity CH HSS effects. A return to
quiet conditions is expected on 29-30 Dec. Predominately unsettled
to active conditions are expected on 31 Dec-03 Jan, with G1 (Minor)
levels likely on 01 Jan, due to effects from a recurrent positive
polarity CH HSS. Quiet conditions are expected for the remainder of
the period.