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910
FXXX06 KWNP 010726
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2014 Sep 01 0657 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
25 - 31 August 2014

Solar activity was at low to moderate levels during the period.
Moderate levels were observed on 25 August due to a pair of M-flares
originating from Region 2146 (N07, L=344, class/area Dki/300 on 26
August). The first was a M2/1b flare at 25/1511 UTC with associated
Type II (707 km/s) and Type IV radio sweeps, a Ten cm radio burst
(150 sfu), and a coronal mass ejection (CME) primarily off the west
limb in SOHO/LASCO C2 imagery beginning at 25/1548 UTC. The second
flare was an M3 at 25/2021 UTC which also had a CME off the west
limb in SOHO/LASCO C2 imagery beginning at 25/2048 UTC. Both CMEs
were determined to be directed too far west to be geoeffective. The
rest of the period was populated with numerous low to mid-level
C-class flares, the majority of which were from Regions 2146 and
2149 (N09, L=284, class/area Dkc/280 on 31 August).

An enhancement of the greater than 10 MeV proton flux at
geosynchronous orbit was observed beginning at approximately 25/2125
UTC likely associated with the M-class flares from Region 2146. A
peak flux value of 1.4 pfu (below S1-Minor) was observed at 25/2300
UTC and thereafter gradually returned to background levels by 27
August.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal levels on 27 August, moderate levels on 25-26 August and
again from 28-29 August. High levels were reached on 30-31 August
with the flux of 1,510 pfu observed at 30/1550 UTC.

Geomagnetic field activity started at quiet levels on 25-26 August.
By early on 27 August, total field increased from 5 nT to a maximum
of 15 nT by 27/0848 UTC, solar wind speed slowly increased, and the
Bz component went south for the majority of the day reaching a
maximum of -14 nT indicative of the arrival of a pair of CMEs that
were associated with flare activity from Region 2146 on 22 August.
Solar wind continued to slowly increase through 29 August when it
became variable between approximately 380 km/s to 480 km/s. Phi
angle became mostly positive (away) by late on 27 August and
remained so during the rest of the period. This was indicative of a
slow transition from CME activity into positive polarity coronal
hole high speed streams (CH HSS) by mid to late on 28 August. The
geomagnetic field responded with mostly quiet to active conditions
from 27 August through 31 August with isolated minor storm periods
observed on 28-29 August. Periods of major storm levels were
observed at high latitudes on 27-28 August and again on 30-31 August
with an isolated severe storm period observed on 29 August.




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