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 Mar 20 0728 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
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WEEK 950 from 2019 Mar 11
SOLAR ACTIVITY
---------------
Solar activity was very low with X-ray flux below B level throughout the
week.
Catania group 9 (NOAA 2734) was in decay at the start of the week and a
very short lived spotted region (Catania group 10) emerged and decayed in
less than 24 hours near the middle of the week.

Coronagraph images showed a faint and slow Eastward CME in the morning of
March 12. Although faint, its angular extent can be seen to reach close to
180 degrees hence classifying as partial halo. The CME is also and more
clearly visible in STEREO A COR2 images moving there straight towards the
West confirming the CME is heading towards a direction in between Earth and
STEREO A. It's speed was estimated not to exceed background solar wind. It
could not be excluded that a component of the CME would reach Earth by late
March 16 or March 17, although effects were expected to be minimal.

An equatorial negative polarity coronal hole passed the central meridian
overnight March 10/11.
And an equatorial coronal hole of positive polarity crossed the central
overnight March14/15.

The Solar proton flux levels were at background values throughout the week.
GEOMAGNETIC ACTIVITY
---------------------
Solar wind conditions were slightly enhanced. A first enhancement was seen
on March 12 associated to the arrival of the March 8 CME, causing an
increase in solar wind speed to around 400 km/s and Bz reaching some
-8-9nT.
The main solar wind features were then towards the end of the week with a
slow forward shock on March 15, 6:17UT followed by a minor increase of
solar wind speed to some 400 km/s which later became more pronounced to 450
km/s, March 16, afternoon. That period in turn transitioned in what appears
to be the passing of the March 12 CME all across March 17. This was
associated with a very prolonged period of negative Bz down to -6nT with a
peak to -8nT.

In response active conditions were measured peaking with minor geomagnetic
storms after midnight March 16/17. Otherwise geomagnetic conditions were
quiet to unsettled.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2019 Mar 11   011    012   070   002   ////   0   0   
2019 Mar 12   011    011   071   008   ////   0   0   
2019 Mar 13   000    000   071   004   ////   0   0   
2019 Mar 14   014    000   070   011   ////   0   0   
2019 Mar 15   000    000   070   009   ////   0   0   
2019 Mar 16   ///    000   070   015   ////   0   0   
2019 Mar 17   ///    000   069   015   ////   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.