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  Weekly Space Weather Highlights
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Highlights of Solar and Geomagnetic Activity
10 - 16 September 2018

Solar activity was very low throughout the period. Region 2722 (S07,
Lo=215, class/area Bxo/10 on 11 Sep) produced the strongest flare of
the period, a B1 flare at 11/0759 UTC. The region decayed to plage
in the following days. No Earth-directed CMEs were observed in
available coronagraph imagery. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit ranged
from normal background to high levels. High levels were reached on
12-16 Sep and moderate levels were reached on 10-11 Sep. All
enhancements in electron flux are associated with the influence of a
positive polarity CH HSS. 

Geomagnetic field activity ranged from quiet to G2 (Moderate)
geomagnetic storm levels. The onset of a CIR ahead of a positive
polarity CH HSS on 10 Sep increased geomagnetic activity to G1
levels. As wind speeds increased to around 550 km/s on 11 Sep,
geomagnetic activity further increased to G2 (Moderate) geomagnetic
storm levels. Total magnetic field strength (Bt) peaked at 15 nT
late on 10 Sep. Bt then decreased to near 5-6 nT by mid-day on 11
Sep, which decreased the geomagnetic response to mostly quiet to
active levels. One additional period of isolated G1 (Minor)
geomagnetic storming was observed early on 14 Sep. Wind speeds
persisted at elevated levels through 16 Sep, with a notable increase
to a peak around 650 km/s observed early on 15 Sep. As wind speeds
decreased, quiet to unsettled levels on 15 Sep gave way to quiet
levels on 16 Sep. 

Forecast of Solar and Geomagnetic Activity
17 September - 13 October 2018

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

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at moderate levels on 06-08 Oct and at high levels
for the remainder of the outlook period. All enhancements in
electron flux are expected due to multiple, recurrent CH HSSs. 

Geomagnetic field activity is expected to range from quiet to G2
(Moderate) geomagnetic storm levels. G2 (Moderate) geomagnetic storm
levels are expected on 08 Oct; G1 (Minor) geomagnetic storm levels
are expected on 07 Oct and 10 Oct; active conditions are expected on
17 Sep, 23 Sep, 02 Oct and 11 Oct; unsettled conditions are expected
on 18 Sep, 24 Sep, 01 Oct, 09 Oct and 12 Oct. All levels of elevated
geomagnetic activity are due to the anticipated influence of
multiple, recurrent CH HSSs.