Routine Space Environment Product Issued Weekly
Issued by NWS

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FXXX06 KWNP 250455
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2017 Sep 25 0425 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
#
#                7-day Space Weather Highlights
#
Highlights of Solar and Geomagnetic Activity
18 - 24 September 2017

Solar activity was at very low levels with a few B-class flares
observed. Old active Region 2673 (S09, L=119), a major flare
producer on its previous transit, returned on 24 Sep and was
numbered 2682 (S09, L=127, Hsx/180 on 24 Sep). No Earth-directed
CMEs were detected during the period.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
high levels throughout the period with a maximum flux of 36,942 pfu
observed at 22/1655 UTC.

Geomagnetic field activity began the period on 18 Sep at mostly
unsettled to G1 (Minor) storm conditions under the influence of a
positive polarity CH HSS. During the 18th, solar wind speeds peaked
at near 720 km/s, total field ranged between 2-6 nT while the Bz
component varied between +5 nT to -6 nT. Quiet to unsettled
conditions prevailed on 19-20 Sep under waning CH HSS influence.
Mostly quiet conditions, with isolated unsettled intervals, were
observed from 21-24 Sep. Beginning on 19 Sep, solar wind exhibited a
steady decline in speed to a low of about 320 km/s at 24/2100 UTC.
Thereafter, and through the remainder of 24 Sep, solar wind speed
increased to near 415 km/s, total field peaked at 10 nT while the Bz
component varied between +6 nT to -9 nT. A SSBC from a positive to a
negative orientation was observed at about 24/1905 UTC.



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