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

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:Issued: 2018 Jan 16 1322 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 889 from 2018 Jan 08
SOLAR ACTIVITY
---------------
During this week solar flaring activity was very low without C-class or
even B-class flares reported.
All three sunspot groups (NOAA ARs 2693, 2694, 2695), observed on the
visible side of the solar disc this week, had simple configuration of its
photospheric magnetic field (alpha and beta).
There was no wide or Earth-directed CMEs observed and the solar protons
remained at background level during the whole week. 
There was one coronal hole observed on the visible side of the solar disc
this week. 
Rather small coronal hole situated close to equator (between N05 and N30)
reached central meridian in the morning of January 09.
GEOMAGNETIC ACTIVITY
---------------------
The week started with the arrival of the shock wave, at 05:55 UT on January
08, detected in the in situ observations (from DSCOVR satellite). The
sudden increase of the solar wind speed (from about 290 to 350 km/s) was
observed simultaneously with the increase of the density, temperature and
the interplanetary magnetic field magnitude (from about 6 nT to 15 nT).
Since the solar wind speed was rather low, and the Bz component of the
interplanetary magnetic field was mostly positive, the shock arrival did
not induced disturbed geomagnetic conditions. The shock in the solar wind
was related with the arrival of the fast flow associated with the low
latitude extension of the northern polar coronal hole which reached central
meridian on late evening of January 04. The arrival of this fast flow
induced active geomagnetic conditions at around 15 UT on January 08 (local
station at Dourbes reported K=4 and NOAA reported Kp=4). 
The fast solar wind associated with the coronal hole which reached central
meridian in the morning of January 09, arrived to the Earth in the late
evening of January 13. The maximum value of the observed wind speed was
about 610 km/s while the Bz component of the interplanetary magnetic field
had minimum value of about -12 nT. The arrival of this fast flow induced
disturbed geomagnetic conditions, NOAA reported Kp=5 in the early morning
of January 14 and local station at Dourbes reported values of  K=3.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2018 Jan 08   ///    013   070   009   A2.8   0   0   
2018 Jan 09   ///    012   071   010   A3.0   0   0   
2018 Jan 10   ///    019   070   003   A3.2   0   0   
2018 Jan 11   024    011   071   003   A3.1   0   0   
2018 Jan 12   012    000   071   004   A3.1   0   0   
2018 Jan 13   ///    000   071   005   A3.0   0   0   
2018 Jan 14   ///    000   071   015   A3.0   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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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.