Routine Space Environment Product (Daily)
Issued by NWS

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FXXX12 KWNP 191231

:Product: Forecast Discussion
:Issued: 2017 Sep 19 1230 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
#             Forecast Discussion
Solar Activity

.24 hr Summary...
Solar activity was very low. Region 2680 (N08W46, Hsx/alpha) remained
inactive. No Earth-directed CMEs were visible in available coronagraph

Solar activity is expected to remain very low over the next three days
(19-21 Sep).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux was at moderate to high levels with
a maximum flux of 31,067 pfu at 18/1655 UTC. The greater than 10 MeV
proton flux was at background values.

The greater than 2 MeV electron flux is expected to continue at high
levels the next three days (19-21 Sep), with a chance for very high
levels, due to CH HSS influences. The greater than 10 MeV proton flux is
expected to continue at background levels all three days.

Solar Wind

.24 hr Summary...
Solar wind parameters were indicative of continued CH HSS influences.
Total field strength ranged primarily from 3 to 5 nT. The Bz component
was variable. Solar wind speeds gradually declined from speeds near 675
km/s to 500 km/s by periods end. The phi angle was primarily positive.

Solar wind speed is expected to remain elevated all three days (19-21
Sep), but decline as the influence of the extension of the north polar,
positive polarity CH HSS wanes.


.24 hr Summary...
The geomagnetic field was quiet to unsettled.

The geomagnetic field is expected to be quiet to unsettled, with a few
isolated active periods likely on days one and two (19-20 Sep). Day
three (21 Sep) is expected to be at quiet to unsettled levels as CH HSS
influences wane. is the U.S. government's official web portal to all federal, state and local government web resources and services.