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FXXX06 KWNP 250826

:Product: 7-day Space Weather Highlights
:Issued: 2014 Aug 25 0742 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
#                7-day Space Weather Highlights
Highlights of Solar and Geomagnetic Activity
18 - 24 August 2014

Solar activity ranged from low to high levels. Low levels persisted
from 18 August through 20 August. By 21-22 August, moderate levels
were observed as Region 2149 (N11, L=278, class/area Eac/190 on 24
August) produced an M3/Sf flare at 21/1331 UTC and an M1/1f at
22/0628 UTC. Other activity on 22 August included a C2/Sf flare at
22/1027 UTC and a C6/Sn flare at 22/1552 UTC from Region 2146 (N09,
L=346, class/area Dki/280 on 24 August). The C2 flare had an
associated Type II (465 km/s) and Type IV radio emissions along with
a partially Earth-directed coronal mass ejection (CME) first
observed off the west limb in SOHO/LASCO C2 imagery at 22/1124 UTC.
The C6 flare also had a Type II radio sweep (449 km/s) as well as a
partial Earth-directed CME first visible in SOHO/LASCO C2 imagery at
22/1636 UTC. By 23 August, low levels returned, however Region 2146
did produce two flares (C6/Sf at 23/1727 UTC and a C1/Sf at 24/0016
UTC) with associated CMEs that were determined not to have a
geoeffective component. By 24 August, high levels were observed due
to an M5/2b flare at 24/1217 UTC from Region 2151 (S07, L=255,
class/area Hax/110 on 24 August) which rotated around the SE limb on
23 August as a relatively simple looking alpha magnetic spot
classification. Associated with this event was fairly weak discrete
radio emissions, along with a Type II radio sweep (593 km/s), 10 cm
radio burst (410 sfu), and an impressive CME off the ESE limb
visible in SOHO/LASCO C2 imagery beginning at 24/1236 UTC. Due to
the trajectory and location of this CME, it is unlikely to have a
geoeffective component.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was
normal to moderate levels. Moderate levels were observed from 21
August through 24 August.

Geomagnetic field activity ranged from quiet to major storm levels.
The geomagnetic field was quiet until late on 19 August when a CME
associated with a filament eruption on 15 August impacted the
geomagnetic field. At approximately 19/0558 UTC, a shock passage was
observed at the ACE spacecraft. Total field increased from 7 to 13
nT, the Bz component went south to -11 nT, and solar wind speed
increased from 289 km/s to 400 km/s initially. By 20 August, solar
wind speed reached a maximum of 452 km/s at 19/1545 UTC before
slowly declining thereafter. Total field reached a maximum of 21 nT
at 20/0427 UTC while the maximum southward deflection of the Bz
component reached -16 at 19/1936 UTC. A geomagnetic sudden impulse
of 12 nT was observed in the Boulder magnetometer at 19/0700 UTC.
Quiet to unsettled conditions were initially experienced until late
on 19 August when active to major storm levels were observed. Quiet
conditions prevailed on 20 August despite the continued presence of
the 15 August CME observed in ACE solar wind measurements. Quiet to
unsettled conditions were observed on 21-22 August as CME effects
slowly diminished. Quiet conditions were observed on 23-24 August. is the U.S. government's official web portal to all federal, state and local government web resources and services.