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: 2017 Nov 13 1530 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 880 from 2017 Nov 06
SOLAR ACTIVITY
---------------
Over the past week, the solar activity was low as the solar disc remained
spotless the whole week. No flare has been recorded and the X-ray flux
remained below C-class flare level. 

Several filaments were observed in H alpha solar images. On Nov 10, one of
the filaments located in the North-East quadrant erupted creating a wide
spread coronal dimming early morning. The eruption was then detected in
SOHO/LASCO-C2 coronagraph on Nov 10 at 08:12 UT, but no Earth directed
component was identified. No other Earth directed Coronal Mass Ejection
have been observed, and the solar protons remained at background levels
over the past 24 hours.
GEOMAGNETIC ACTIVITY
---------------------
Until Nov 07 early morning, the solar wind environment remained at nominal
level: The wind speed was around 300 km/s, the interplanetary magnetic
field magnitude remained below 6 nT, and Bz component fluctuated between -2
and 2 nT. On Nov 07, the solar wind conditions became enhanced due to the
sector boundary crossing at 03:00 UT (from a negative to a positive
sector), which announced the soon arrival of the high speed stream
associated with the northern extension Coronal Hole that has transited the
central meridian on Nov 04. The wind speed then consistently increased to
reach 650 km/s on Nov 07 around 19:15 UT, after a slight decrease (up to
500 km/s on Nov 09), it reached 710 km/s on Nov 10 around 13:00 UT and
finally continuously decreased to the value of 400 km/s at the end of the
week. The interplanetary magnetic field magnitude reached a maximum of 23
nT on Nov 07 at 15:48 UT, and the Bz component fluctuated between -15 and
13 nT being mainly negative around that period of time. These enhanced
solar wind conditions persist until Nov 10 afternoon, then decrease to
return to nominal conditions at the end of the week.

Disturbed geomagnetic conditions were observed on Nov 07, 08, and 09 with
K-Dourbes up to 5 and Kp-NOAA up to 6 due to the arrival of the fast solar
wind and the southward Bz component of the interplanetary magnetic field
over several consecutive intervals. The geomagnetic conditions were then
mostly quiet to unsettled with Kp (NOAA) and local K (Dourbes) indexes
ranging between 0-3 at the end of the week.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Nov 06   000    000   069   001   A3.7   0   0   
2017 Nov 07   000    000   068   034   A3.4   0   0   
2017 Nov 08   000    000   068   041   A3.6   0   0   
2017 Nov 09   000    000   066   025   A3.9   0   0   
2017 Nov 10   ///    000   069   020   A3.9   0   0   
2017 Nov 11   ///    000   067   008   A4.1   0   0   
2017 Nov 12   ///    000   069   007   A5.4   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.