Routine Space Environment Product Issued Weekly
Issued by NWS

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FXXX06 KWNP 230226
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2018 Apr 23 0149 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
16 - 22 April 2018

Solar activity was very low. Region 2706 (N03, L=281, class/area
Dao/130 on 22 Apr) produced the strongest flare of the period, a B5
at 20/1704 UTC. The region continued slow growth through the end of
the reporting period. 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 ranged
from normal to high levels on 10-20 Apr; high levels on 22 Apr and
moderate to high levels for the remaining days of the reporting
period. The peak flux observed was 24,100 pfu at 21/2120 UTC.

Geomagnetic field activity was quiet until 20 Apr, when unsettled to
G2 (Moderate) geomagnetic conditions were observed in response to
CIR ahead of a negative polarity CH HSS. Total field peaked at 23 nT
around 20/0510 UTC and slowly declined to around 5 nT by late on 20
Apr. Solar wind speeds were increased from around 290 km/s to a peak
of near 620 km/s during the HSS proper late on 20 Apr. The
geomagnetic response decreased to quiet to unsettled conditions over
21 Apr and finally to quiet on 22 Apr as influence from the CH HSS
waned.


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