SIDC Weekly Bulletin

:Issued: 2018 Dec 10 1243 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 936 from 2018 Dec 03
SOLAR ACTIVITY
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The solar activity has been quiet over the past week. One small bipolar
sunspot group (Catania sunspot group 2, NOAA 2729) emerged on the Sun on
December 05. It remained globally stable and did not produce any
significant flare. 

No Earth directed Coronal Mass Ejection has been observed. The greater than
10 MeV solar protons flux remained at nominal levels over the past week.
GEOMAGNETIC ACTIVITY
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The solar wind Earth environment was under the influence of the enhanced
solar wind associated with first the coronal hole that reached the central
meridian on November 27, and second with the one that reached the central
meridian on December 04. The solar wind speed reached the maximum values of
654 km/s on December 09, which we have linked to the second coronal hole.
The interplanetary magnetic field strength reached values up to 11.6 nT due
to the arrival of the fast solar wind associated with the second coronal
hole. The southward magnetic component fluctuated between -10 and 10 nT and
showed only a few short periods of negative values. 

The geomagnetic conditions were quiet to unsettled with a several but short
periods of active condition observed by the local station in Dourbes and
the NOAA K-index  (K-Dourbs=4, Kp=4).
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2018 Dec 03   000    000   068   008   ////   0   0   
2018 Dec 04   ///    000   069   ///   ////   0   0   
2018 Dec 05   017    018   ///   ///   ////   0   0   
2018 Dec 06   ///    020   ///   ///   ////   0   0   
2018 Dec 07   ///    017   ///   ///   ////   0   0   
2018 Dec 08   ///    000   ///   ///   ////   0   0   
2018 Dec 09   ///    000   ///   ///   ////   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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