Routine Space Environment Product Issued Weekly
Issued by NWS

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FXXX02 KWNP 180358
WEKFOR

:Product: 27-day Space Weather Forecast
:Issued: 2017 Sep 18 0327 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
#
#               27-day Space Weather Forecast
#
Forecast of Solar and Geomagnetic Activity
18 September - 14 October 2017

Solar activity is expected to be at predominately very low levels on
18-22 Sep and 08-14 Oct. R1-R2 (Minor-Moderate) levels are expected
on 23 Sep-07 Oct due to the return of old Region 2673 (S09, L=119).

The greater than 10 MeV protons at geosynchronous orbit are expected
to remain at background levels from 18-22 Sep and 08-14 Oct. A
chance for an S1-S2 (Minor-Moderate) proton event is possible from
23 Sep-07 Oct in association with significant flare activity after
the return of old Region 2673.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at high levels on 18-22 Sep, 28 Sep-19 Oct and 12-14
Oct due to CH HSS influence. Normal to moderate levels are expected
for the remainder of the outlook period.

Geomagnetic field activity is expected to be at unsettled to active
levels on 18-20 Sep, 24-25 Sep and 30 Sep-02 Oct with G1 (Minor)
storm conditions possible on 27-29 Sep and 11-14 Oct due to
recurrent CH HSS activity. Mostly quiet conditions are expected for
the remainder of the outlook period.



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