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WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2014 Sep 15 0717 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
08 - 14 September 2014

Solar activity ranged from low to high levels during the period.
Moderate levels were reached on 8, 11, and 14 September with high
levels reached on 10 September. Moderate levels were first reached
on 09 September at 0029 UTC when active sunspot region 2158 (N16,
L=087, class/area Dkc/440 on 11 September) produced a long duration
M4/1n flare. This flare had associated Type II (999 km/s estimated
shock velocity) and Type IV radio sweeps, a 10cm (370 sfu) radio
burst, and an asymmetrical, full-halo coronal mass ejection (CME)
which was first observed in LASCO/C2 imagery at 09/0006 UTC. The
majority of the ejecta appeared to be heading north and east of the
Sun/Earth line, however, it was later determined this event
contained an Earth-directed component. On 10 September, conditions
reached High levels as Region 2158 produced a X1/2b flare at 1745
UTC. It also had associated Type II (3750 km/s estimated shock
velocity) and Type IV radio sweeps, a 10cm (1300 sfu ) radio burst,
and an Earth-directed full halo CME. On 11 September, Region 2166
(N13, L=352, class/area Dao/60 on 14 September) produced an M2 flare
at 1526 and an M1 flare at 2126 UTC, just prior to rotating on to
the visible disk. After returning to low levels on 12 and 13
September, conditions again rose to Moderate levels as Region 2157
(S14, L=98, class/area Ekc/540 on 6 September) produced an M1/2n
flare at 14/0216 UTC. The coronal mass ejection (CME) associated
with this M-flare was observed off the west limb in SOHO/LASCO C2
coronagraph imagery beginning at 14/0248 UTC, but was deemed to be
well off the Sun-Earth line. Other activity included a filament
eruption observed in SDO/AIA 193 imagery beginning at 12/1749 UTC
west of Region 2158 near center-disk. SOHO/LASCO C2 imagery showed a
coronal mass ejection (CME) beginning at 12/1936 UTC that was mostly
obscured by a larger backsided CME off the NNE limb that preceded it
beginning at 12/1836 UTC. WSA-ENLIL modeling of the event indicates
a likely CME arrival around midday on 16 Sep.

The greater than 10 MeV proton flux was elevated on 8 and 9
September due to a particle enhancement from an event the week
prior. Late on 10 September, levels began a quick rise following the
X1/2b flare from Region 2158, mentioned earlier. By 11 September,
the greater than 10 MeV levels had reached a peak of 28 pfu (S1 -
Minor), but then leveled off for the next 24 hours. Storm levels
briefly reached the S2 (Moderate) threshold, in conjunction with the
arrival of the CME, and reached a maximum of 126 pfu at 12/1355 UTC.
During this time, the greater than 100 MeV proton flux levels began
to rise as well, reaching the 1.2 pfu at 11/0425 UTC level before
tapering off shortly thereafter.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal levels on 8, 9, 11, 13, and 14 September, and reached
moderate levels on 10 and 12 September.

Geomagnetic field activity was at quiet to severe storm levels
during the period. Quiet to unsettled levels occurred from 8 to 11
September, with an isolated active period on 11 September. A
geomagnetic Sudden Impulse (33 nT) was observed at the Boulder
magnetometer at 11/2346 UTC, indicating the arrival of the 09 Sep
CME as anticipated. The geomagnetic field responded, pushing
geomagnetic field conditions to minor storm levels. Conditions
moderated for approximately 9 hours back at quiet to unsettled
levels, until the second CME arrived at Earth. Total field rose to a
max of 31 nT and solar wind increased to near 790 km/s by late on 12
September. A geomagnetic sudden impulse of 43 nT was observed at the
Boulder magnetometer at 12/1555 UTC. Conditions then increased to
minor to severe storm levels for the next 9 hours. Conditions fell
to active levels early on 13 September and continued to decline to
quiet levels by mid day as the Bz component remained in a northward
orientation (not well connected). Quiet conditions remained through
14 September.


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