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: 2019 Feb 18 1407 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 946 from 2019 Feb 11
SOLAR ACTIVITY
---------------
Solar activity was at very low levels. No flares were recorded and the
solar disk was spotless. No earth-directed coronal mass ejections (CMEs)
were observed. The greater than 10 MeV proton flux was at nominal levels.
GEOMAGNETIC ACTIVITY
---------------------
Solar wind parameters were at nominal levels at the start of the week
before gradually increasing under the influence of the stream associated
with the extension of the southern polar coronal hole, which transited the
central meridian on the 10-13th of February. DSCOVR recorded a maximum
solar wind speed of 533 km/s on the 14th of February and a minimum Bz value
of -8 nT on the 13th of February. The solar wind speed then gradually
decreased from the 14th of February returning to background levels by the
16th. The interplanetary magnetic field (IMF) was predominantly directed
towards the Sun (negative sector).

The geomagnetic conditions were mostly quiet to unsettled over the week
with a few short active periods coinciding with the observed enhanced
negative Bz.  The local K index at Dourbes reached active conditions (K=4)
on the 11th and 13th between 16-17 UT and 17-20 UT, respectively, while the
planetary K index reached active conditions (Kp=4) for only one short
interval between 9-12 UT on the 13th of February.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2019 Feb 11   000    000   070   010   ////   0   0   
2019 Feb 12   ///    000   070   005   ////   0   0   
2019 Feb 13   ///    012   070   011   ////   0   0   
2019 Feb 14   ///    000   071   012   ////   0   0   
2019 Feb 15   000    000   071   004   ////   0   0   
2019 Feb 16   ///    000   071   003   ////   0   0   
2019 Feb 17   ///    000   070   005   ////   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.