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901
FXXX06 KWNP 280526
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2014 Jul 28 0505 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
21 - 27 July 2014

Solar activity was at very low levels on 21 - 23 July with several
B-class events obsered. Activity increased to low levels on 24 - 27
July with a few weak C-class events recorded. Region 2121 (N07,
L=317, class/area Cao/210 on 24 Jul) produced a C2/1f flare at
24/0151 UTC. At 25/0702 UTC, this same region produced a C2/1n flare
with an associated Type II radio sweep with an estimated shock
velocity of 1090 km/s.

26 July saw a C1 x-ray event from Region 2125 (S13, L=266,
class/area Cao/040 on 27 Jul) at 0504 UTC. This was followed by a
trio of C1 events from Region 2123 (S14, L=323, class/area Dao/040
on 24 Jul) at 1143 UTC, 1210 UTC and 1320 UTC. The period ended on
27 July with a C2/Sf flare at 0551 UTC from Region 2125 followed by
a C1 event from Region 2127 (S08, L=248, class/area Dao/080 on 27
Jul).

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal levels.

Geomagnetic field activity was at predominately quiet levels with
isolated unsettled periods observed late on 23 July and again early
on 25 July. Sustained southward Bz, associated with a solar sector
boundary crossing, was responsible for the unsettled periods late on
the 23rd while a weak positive polarity coronal hole high speed
influenced the magnetic field early on the 25th.

Solar wind parameters reflected the quiet to isolated unsettled
coditions during the summary period. Solar wind speeds ranged from a
low of about 270 km/s early in the period, peaking at near 425 km/s
midday on 26 July and finishing the period at about 350 km/s. The
interplanetary magnetic field Bt ranged from 2 to 8 nT while the Bz
component varied between +/- 7 nT. The phi component began the
period in a positive (away) orientation, switched to a more negative
(towards) sector midday on 21 July and remained so through about
23/1600 UTC when the phi angle became variable through 24/1145 UTC.
For the balance of the period, phi settled into a more positive
orientation.




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