:Product: Forecast Discussion
:Issued: 2018 Dec 11 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Activity

.24 hr Summary...
Solar activity was very low. No Earth-directed CMEs were observed in
available satellite imagery.

.Forecast...
Solar activity is expected to continue at very low levels on 11-13 Dec.

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux ranged from normal to high levels,
reaching a peak flux of 1,018 pfu at 2055 UTC. The greater than 10 MeV
proton flux remained at background values.

.Forecast...
The greater than 2 MeV electron flux is expected to be at moderate to
high levels on 11-13 Dec. The greater than 10 MeV proton flux is
expected to continue at background levels.

Solar Wind

.24 hr Summary...
Solar wind parameters continued to be enhanced under the influence of a
negative polarity CH HSS. Solar wind speed ranged from 550-670 km/s.
Total magnetic field strength remained around 5 nT during the period. Bz
ranged between +/- 4 nT. Phi angle was mostly oriented in a negative
(towards) solar sector.

.Forecast...
A return to nominal levels is expected over 11 Dec. By mid to late on 12
Dec, another negative polarity CH HSS is likely to cause a much weaker
enhancement to the solar wind environment, which will continue into 13
Dec.

Geospace

.24 hr Summary...
The geomagnetic field was at quiet to unsettled levels due to continued
CH HSS effects.

.Forecast...
A return to mostly quiet conditions is expected on 11 Dec. Isolated
unsettled conditions are likely on 12-13 Dec due to the anticipation of
a weak enhancement from a small, negative polarity CH HSS.