SIDC Weekly Bulletin

Review of past solar and geomagnetic activity.
Source SIDC (RWC-Belgium)
Frequency Weekly
Format Plain text
Mail header SIDC Weekly Bulletin
SIDC code bul

Archive

Latest issue

:Issued: 2017 Dec 11 1318 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 884 from 2017 Dec 04
SOLAR ACTIVITY
---------------
Over the past week, the solar activity was low. No C-class flare or above
has been recorded. One sunspot has emerged on Dec 6 (Catania sunspot group
65, NOAA Active Region 2690) and rapidly decay on Dec 8. Another sunspot
emerged on Dec 10 (NOAA Active Region 2691) and produced a B1.5-Class flare
on Dec 10 at 10:54 UT. 

No Earth directed Coronal Mass Ejection has been observed, and the solar
protons remained at background levels over the past week.
GEOMAGNETIC ACTIVITY
---------------------
The space weather conditions over the past week were dominated by the
arrival of the high speed stream associated with the northern extension
Coronal Hole that transited the central meridian on Dec 01. On Dec 04
around 15:00 UT, the solar wind conditions were enhanced due to the sector
boundary crossing (from a negative to a positive sector), which announced
the soon arrival of the high speed stream associated with the Coronal Hole.
The interplanetary magnetic field magnitude ranged from 9 to 12 nT until
Dec 05 at about 21:00 UT, and the Bz component fluctuated between -12 and
10 nT. The wind speed consistently increased and reached 630 km/s on Dec 06
around 03:30 UT. A long and slow decrease of the solar wind speed was then
observed to return to nominal level on Dec 10.

Disturbed geomagnetic conditions were observed due to the arrival of the
fast solar wind. Several minor storms were recorded by the local stations
at Dourbes (K=5) on Dec 04 from 19:00 to 20:00 UT and on Dec 05 from 15:00
to 17:00 UT, while NOAA reported minor storms (Kp=5) on Dec 5 at 09:00 and
12:00 UT. From Dec 06 on the geomagnetic conditions return to nominal
conditions until the end of the week.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Dec 04   000    000   068   013   A3.1   0   0   
2017 Dec 05   000    000   068   034   A3.1   0   0   
2017 Dec 06   013    012   068   016   A3.3   0   0   
2017 Dec 07   011    011   068   012   A3.5   0   0   
2017 Dec 08   ///    000   070   006   A3.3   0   0   
2017 Dec 09   ///    000   071   003   A3.7   0   0   
2017 Dec 10   ///    000   072   003   A4.5   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
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center - RWC Belgium                #
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Details

This report is sent once a week, typically on a monday.
The weekly bulletin gives an overview of solar and geomagnetic activity of the past week and includes a noticeable solar events list.
Check the ISES code book for information on ISES codes.