Routine Space Environment Product (Daily)
Issued by NWS

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000
FXXX12 KWNP 151230
DAYDIS

:Product: Forecast Discussion
:Issued: 2017 Dec 15 1230 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
#             Forecast Discussion
#
Solar Activity

.24 hr Summary...
Solar activity was very low. The solar disk was spotless. There were no
Earth-directed CMEs observed in available satellite imagery.

.Forecast...
Solar activity is expected to continue at very low levels over the next
three days (15-17 Dec).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to moderate levels
with a peak flux of 248 pfu observed at 14/2100 UTC. The greater than 10
MeV proton flux was at background levels.

.Forecast...
The greater than 2 MeV electron flux is expected to be at normal to
moderate levels for the next three days (15-17 Dec). The greater than 10
MeV proton flux is expected to continue at background levels throughout
the forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters indicated near background conditions. Solar wind
speeds decreased from about 430 km/s to end the period at 340 km/s.
Total field did not exceed 5 nT and the Bz component was variable
between +3 nT to -4 nT. Phi angle was oriented in a mostly positive
solar sector.

.Forecast...
The solar wind environment is expected to continue at background levels
until late on day three (17 Dec) when elevated wind speeds and enhanced
total field measurements will announce the arrival of a recurrent,
positive polarity CH HSS. Wind speeds are anticipated to exceed 600 km/s
with this feature.

Geospace

.24 hr Summary...
The geomagnetic field was at quiet levels.

.Forecast...
The geomagnetic field is expected to be at mostly quiet levels on days
one, two and three (15-17 Dec). Late on day three, unsettled to active
conditions are expected due to the anticipated arrival of a recurrent,
positive polarity CH HSS.


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