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FXXX06 KWNP 152021
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2014 Dec 15 0655 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 December 2014

NOTE: A power and communications outage, which began on 13 December
2014 at approximately 1200 UTC and lasted until approximately 14
December 2014 at 0101 UTC, resulted in the loss of ACE and GOES
spacecraft data as well as ground-based magnetometer data.
Additionally, a second communications outage from 14 December 2014
at 1405 UTC until 1725 UTC resulted in the loss of GOES-13 satellite
data.

Solar activity reached moderate (R1 - minor on NOAA Scales) levels
with an M1.5 flare from Region 2241 (S11, L=217, class/area=Dac/100
on 14 Dec) on 13 December at 0520 UTC, and an M1/Sf from Region 2242
(S20, L=238, class/area=Dac/100 on 14 Dec) on 14 December at 1933
UTC. Associated with the latter event was a Type II radio emission
with an estimated shock velocity of 1028 km/s and a CME off the SE
limb, first visible in LASCO C2 imagery at 14/2000 UTC. This event
was not expected to be geoeffective, but analysis was underway at
the time of this writing. Both Regions 2241 and 2242 contained
beta-gamma magnetic configurations.

Tyep II radio emissions were also reported on 13 December at 2157
UTC (767 km/s) and earlier at 1448 UTC (955 km/s), both during the
power and communications outage mentioned above. SDO/AIA 304 imagery
from that time period and reports from ground-based observatories
suggests the emissions were associated with activity from Region
2227 (S04, L=002, class/area=Cso/150 on 08 Dec) as it approached the
west limb. SDO/EVE data indicated the 2157 UTC event may have been
associated with an M-class flare. No Earth directed CMEs were
observed in SOHO/LASCO Coronagraph imagery from these events.

The remainder of the week was characterized by C-class flares,
almost a third of which originated from Region 2230 (S15, L=321,
class/area=Dac/190 on 13 Dec). This region was also magnetically
complex, maintaining a beta-gamma configuration for most of the
week. Region 2222 (S19, L=85, class/area=Ekc/770 on 04 Dec) rotated
off the visible disk on 08 December as the largest Region of the
week.

None of the other CMEs observed during the week were judged to be
Earth-directed.

No proton events meeting alert thresholds were observed at
geosynchronous orbit. However, the greater than 10 MeV proton flux
was enhanced, reaching a maximum flux value of 2.5 pfu at 14/1020
UTC. The enhancement was likely the result of significant flare
activity from old Region 2222 (S19, L=102) behind the west limb.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels through 12 December. Insufficient data were available to
characterize the environment on 13-14 December. The peak flux
recorded was 9960 pfu on 08/1815 UTC.

Geomagnetic field activity briefly reached minor storm levels on 12
December, during the 12-15 UTC synoptic period, in response to a
geoeffective positive polarity coronal hole high speed stream. Wind
speed at the ACE spacecraft peaked in the 600-700 km/s range while
Bz dipped to nearly - 11 nT. The high speed stream brough unsettled
to minor storm conditions for all of 12 December. Earlier, a
negative polarity coronal hole high speed stream kept geomagnetic
activity at unsettled to active levels for the first two days of the
week. Solar wind speed began the week at nearly 800 km/s, and
remained above 600 km/s until early on 09 December. By 10 December,
geomagnetic activity had relaxed to quiet to unsettled levels which
persisted until the next high speed stream arrived on the 12th, and
prevailed again on the 13th-14th as the positive polarity coronal
hole high speed stream began to wane.


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