Routine Space Environment Product Issued Weekly
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FXXX06 KWNP 240726
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2017 Jul 24 0308 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
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#                7-day Space Weather Highlights
#
Highlights of Solar and Geomagnetic Activity
17 - 23 July 2017

Solar activity was at low levels on 17-19 Jul and very low levels on
20-23 Jul. Region 2665 (S06, L=111, class/area Ekc/710 on 09 Jul)
produced the strongest flare of the period, a C2 flare observed at
19/0007 UTC from around the west limb. Region 2666 (N13, L=103,
class/area Cro/030 on 13 Jul) was mostly quiet as it decayed to
plage before rotating around the west limb. No Earth-directed CMEs
were observed in available coronagraph imagery.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
high levels throughout the summery period. A maximum flux of 13,630
pfu was observed at 19/1755 UTC.

Geomagnetic field activity ranged from quiet to G2 (Moderate)
geomagnetic storm levels throughout the reporting period. On 17 Jul,
the continuing influence of a CME caused quiet to active conditions
with an isolated period of G2 (Moderate) storm levels reported
during the 1500-1800 UTC synoptic period. Waning CME effects led to
quiet to unsettled conditions on 18 Jul. Conditions were quiet on 19
Jul through early on 20 Jul. Late on 20 Jul conditions reached
unsettled as a solar sector boundary crossing (SSBC) became
geoeffective. An isolated period of active was observed during the
0000-0300 UTC synoptic period on 21 July as total magnetic field
strength (Bt) increased to near 10 nT. Following the SSBC was a
co-rotating interaction region (CIR), causing solar wind speeds to
increase from around 450 km/s to a peak of 800 km/s observed at
21/1804 UTC. With the exception of G1 (Minor) geomagnetic storm
conditions observed during the 22/0900-1200 UTC synoptic period,
quiet to active conditions were observed through the remainder of
the period under the influence of positive polarity CH HSS.


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