Routine Space Environment Product Issued Weekly
Issued by NWS
FXXX06 KWNP 130826
:Product: 7-day Space Weather Highlights
:Issued: 2013 May 13 0755 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
06 - 12 May 2013
Solar activity was low for the first half of the week, and moderate
for the second. After a slow start with only low-level C-class
flares from the regions on the disk, activity jumped up to moderate
levels on 10 May when Region 1745 (N14, L=336, class/area=Ekc/600 on
12 May) unleashed an M3.9 flare at 0057Z shortly after rotating
around the east limb. Later that same day, Region 1745 produced an
M1.3 flare at 1256Z. Region 1745 and 1744 (N05, L=259,
class/area=Dai/190 on 12 May) were the most productive regions on
the disk during the week, with 10 C-flares each to their credit.
Region 1744 was responsible for the largest C-class flare of the
week, a C9.0 at 09/2316, immediately preceding the beginning of
moderate activity. The 11th was relatively quiet; the largest flare
was a C8.0 from Region 1746 (S27, L=337, class/area=Dhi/270 on 12
May) shortly after it emerged on the disk. However, there was a 16
degree filament eruption centered near N39W50 which began at
11/2230Z. The resulting CME was visible in LASCO/C2 coronagraph
imagery by 12/0000Z. WSA-Enlil output suggested this CME may brush
past Earth late on the 14th or early on the 15th. Moderate activity
returned on 12 April with two M-class events, an M1.9 at 2032Z and
an M1.2 at 2244Z, from a newly emerged region beyond the east limb.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels all week.
Geomagnetic field activity was at quiet to unsettled levels all
week. A positive polarity recurrent coronal hole high speed stream
brought unsettled conditions for the first three days of the week.
The remainder of the week saw quiet geomagnetic conditions.