SIDC Weekly Bulletin

:Issued: 2013 Dec 03 1847 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
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WEEK 674 from 2013 Nov 25
SOLAR ACTIVITY
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NOAA AR 1904 was on the front stage when it comes to flaring activity in
the first part of the week, not literally of course because the region was
near the west limb. Even when the associated sunspot group was not visible
anymore, GOES kept on noticing flaring activity from that region until it
rotated completely in the shadow on the far-side of the Sun where its
coronal loops could not peek anymore over the solar limb.
November 28 and 29, NOAA AR 1907 and 1908 took over the C-flare duty.
November 30, NOAA 1909 appeared in the east, on December 1, 1912 came into
view. Both produced C-flares.

There were 3 (partial) halo CME's. 
The one of November 27 was linked with a filament eruption. It was detected
by CACTus at 15:13UT. The bulk of the plasma was ejected to the North. The
CME could cause a glancing blow but up to now (December 3), there is no
clear evidence of this. 

The November 29 CME which came into the LASCO/C2 field of view (FOV) at
17:36UT. There was no on disk signature. The CME was therefore determined
as back-sided and was probably linked with the activity of NOAA AR 1904.

A similar story for the November 30 CME which came into the LASCO/C2 FOV at
13:48UT. There was again no on-disk signature. Flaring activity and a mass
ejection around that time was although visible with STEREO B EUI 195. This
CME was therefore determined as back-sided.

GEOMAGNETIC ACTIVITY
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The total interplanetary magnetic field increased in strength on November
29. The plasma became at that moment slightly denser. The solar wind speed
and temperature started to increase gradually. This is a typical signature
for a coronal hole. We can trace the co-rotating interaction region and the
fast solar wind back to the small northern coronal hole that reached the
central meridian on November 24. The geomagnetic field was slightly
distorted as the planetary and local (Dourbes) K index reached values up to
3 from November 29 to December 1. Kp was 4 for one 3-hour interval on
November 30, similar the local K in Dourbes reached also 4 that day.
The Kp and local K Dourbes were equal 2 or even below for the other days of
the week. 
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2013 Nov 25   065    ///   119   000   B4.6   0   0   
2013 Nov 26   ///    ///   116   002   B4.5   0   0   
2013 Nov 27   100    ///   129   001   B4.6   0   0   
2013 Nov 28   ///    ///   133   001   B5.0   0   0   
2013 Nov 29   ///    ///   129   008   B3.5   0   0   
2013 Nov 30   ///    ///   131   011   B3.5   0   0   
2013 Dec 01   ///    083   131   009   B3.7   0   0   
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# RC   : Sunspot index (Wolf Number) from Catania Observatory (Italy)
# EISN : Estimated International Sunspot Number
# 10cm : 10.7 cm  radioflux (DRAO, Canada)
# Ak   : Ak Index Wingst (Germany)
# BKG  : Background GOES X-ray level (NOAA, USA)
# M,X  : Number of X-ray flares in M and X class, see below (NOAA, USA)
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NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
NONE
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