Routine Space Environment Product Issued Weekly
Issued by NWS
FXXX06 KWNP 090455
:Product: 7-day Space Weather Highlights
:Issued: 2013 Dec 09 0428 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
02 - 08 December 2013
Solar activity reached moderate levels this period due to an M1/1n
flare on 07 Dec at 0729 UTC from Region 1909 (S18, L=205 class/area
Dkc/350 on 01 Dec), which was the largest event of the period. A
Tenflare (220 sfu) and a Type-II radio sweep (691 km/s) accompanied
this event. A subsequent coronal mass ejection (CME) was observed in
SOHO/LASCO C2 coronagraph imagery beginning on 07 Dec at 0748 UTC.
The bulk of the ejecta associated with this CME appeared to be
directed to the west of Earth, but forecaster analysis and WSA-ENLIL
model output indicate that Earth will likely see a flanking portion
of this CME midday on 10 Dec (See space weather outlook for expected
impacts). While Region 1909 was the most productive region of the
period, contributing several mid-level C-class flares in addition to
the M-class flare, Regions 1913 (S14, L=268 class/area Dao/130 on 04
Dec) and 1916 (S13, L=169 class/area Eai/240 on 08 Dec) also
contributed many low-level C-class flares throughout the period.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at
predominately normal levels with moderate levels observed briefly on
06 Dec from 1020 - 1915 UTC and on 07 Dec from 1555 - 2000 UTC,
reaching a maximum flux value of 159 pfu on 06 Dec at 1215 UTC.
Geomagnetic field activity was at quiet levels on 02 Dec and 04 - 06
Dec. Unsettled conditions were observed on 03 Dec due to a prolonged
period of southward Bz and on 07 Dec with initial onset of a strong
positive polarity coronal hole high speed stream (CH HSS). An
isolated period of G2 (Moderate) geomagnetic storm conditions was
observed on 08 Dec at 0000 - 0300 UTC due to a strong co-rotating
interaction region (CIR) followed by the CH HSS. An isolated period
of G1 (Minor) geomagnetic storm conditions followed for the 0300 -
0600 UTC synoptic period. CH HSS influence began to subside midday
on 08 Dec and active to quiet conditions were observed for the
remained of the day.