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 Mar 27 1529 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 847 from 2017 Mar 20
SOLAR ACTIVITY
---------------
The GOES X-ray background was below B1 level throughout the week. The only
regions were NOAA AR 2643 (alpha) and 2644 (beta), which produced only a
few low B flares. A weak filament eruption in the NE quadrant was observed
in GONG H alpha and AIA HeII images around 17h UT on March 22. CACTUS
detected an associated, narrow CME around 18:36 UT which was not
geoeffective.
GEOMAGNETIC ACTIVITY
---------------------
A high speed stream from a positive coronal hole arrived at Earth in the
first half of March 21. In the days after, solar wind speeds up to about
750 km/s were registered by DSCOVR while the magnitude of the
Interplanetary Magnetic Field reached a maximum of 18 nT on March 21. Bz
fluctuated a lot in this period. A few intervals with minor geomagnetic
storm conditions (K Dourbes = 5) were registered on March 21 and 22. Solar
wind speed started decreasing again to nominal levels on March 24.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Mar 20   000    000   073   002   A1.9   0   0   
2017 Mar 21   013    012   071   032   A2.8   0   0   
2017 Mar 22   ///    013   073   028   A1.8   0   0   
2017 Mar 23   024    014   072   010   A1.6   0   0   
2017 Mar 24   ///    013   072   006   A1.2   0   0   
2017 Mar 25   ///    015   074   003   A3.0   0   0   
2017 Mar 26   ///    027   077   004   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.