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 Jan 10 0816 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 836 from 2017 Jan 02
SOLAR ACTIVITY
---------------
Solar activity was very quiet with X-ray flux remaining at background
level.
Only a small number of short lived sunspot groups were present at the start
of the weak producing at most a B1.8 flare.
No earth directed CMEs have been observed in coronagraph data.
Proton flux values were at background levels.
GEOMAGNETIC ACTIVITY
---------------------
Solar wind was dominated by the arrival of the high speed stream from the
trans equatorial extension of the negative polarity Southern polar coronal
hole.
The bulk of the coronal hole extension is preceded by a smaller part which
influenced solar wind speed from just before noon January 3 into the
afternoon, with speed reaching a peak of 550 km/s before settling to a
background of below 400km/s. Before noon January 4 a renewed increase of
the solar wind to about 550km/s was just another prelude to the main bulk
of the high speed stream which set in around noon January 5. Speeds then
reached values of over 700 km/s which persisted over the rest of the week
(January 6, 7, 8).
Total magnetic field enhancements were associated to the interaction
regions at the high speed onsets and saw maxima of at most 15 nT. During
the main part of the high speed stream influence (from January 6 onwards)
total magnetic field was around the nominal 5nT regime. Bz was variable
throughout the period.
With no periods of sustained negative Bz, enhancement of the geomagnetic
conditions under the high speed stream influence, remained restricted to
some periods of active conditions within otherwise quiet to unsettled
conditions.
---------------------------------------------------------------------------
DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Jan 02   023    000   073   006   A5.7   0   0   
2017 Jan 03   013    000   073   013   A5.5   0   0   
2017 Jan 04   011    000   072   015   A5.4   0   0   
2017 Jan 05   000    000   073   020   A5.5   0   0   
2017 Jan 06   ///    000   072   014   A5.6   0   0   
2017 Jan 07   ///    000   072   024   A5.8   0   0   
2017 Jan 08   ///    000   072   021   A5.5   0   0   
---------------------------------------------------------------------------
# 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)
---------------------------------------------------------------------------

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
NONE
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center - RWC Belgium                #
# Royal Observatory of Belgium                                       #
# Fax : 32 (0) 2 373 0 224                                           #
# Tel.: 32 (0) 2 373 0 491                                           #
#                                                                    #
# For more information, see http://www.sidc.be.  Please do not reply #
# directly to this message, but send comments and suggestions to     #
# 'sidctech@oma.be'. If you are unable to use that address, use      #
# 'rvdlinden@spd.aas.org' instead.                                   #
# To unsubscribe, visit http://sidc.be/registration/unsub.php        #
#                                                                    #
# Legal notices:                                                     #
# - Intellectual Property Rights:                                    #
#   http://www.astro.oma.be/common/internet/en/data-policy-en.pdf    #
# - Liability Disclaimer:                                            #
#   http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf     #
# - Use and processing of your personal information:                 #
#   http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf #
#--------------------------------------------------------------------#

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.