SIDC Weekly Bulletin

:Issued: 2020 Jan 20 1439 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 994 from 2020 Jan 13
SOLAR ACTIVITY
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During this week solar flaring activity was very low, without C-class or
even B-class flares reported. During the whole week there were no numbered
active regions observed on the visible side of the Sun.
One CME, possibly Earth-directed was observed this week. The CME was
observed on January 14, originating from the decaying active region
(Catania sunspot group 27), at the moment of eruption (about 09:55 UT)
situated close to the Solar disc center. Although the on-disc signatures of
the CME, i.e. coronal dimming and EUV wave were observed, the CME was not
observed by SOHO/LASCO C2 coronagraphs. Only few available coronagraph
images from STEREO/COR2 coronagraph show presence of the weak and rather
narrow CME with the speed of about 200 km/s. The CME was possibly
Earth-directed, and it’s arrival, although it was not very probable was
late on January 19.
The solar protons remained at the background level during the whole week. 


	One coronal hole was observed on the visible side of the Sun this week.
The patchy equatorial coronal hole of negative polarity has reached central
meridian on January 16.
GEOMAGNETIC ACTIVITY
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During this week Earth was inside the slow solar wind with the speed
between 290 and 390 km/s. The interplanetary magnetic field magnitude was
mostly in the range of 3 to 7 nT.
The increase of the density and fluctuation of the interplanetary magnetic
field observed in the morning of January 16, was followed by the increase
of the temperature and solar wind speed. These observations showed possible
arrival of the solar wind from the positive polarity coronal hole that
reached central meridian on January 10 (previous week). Nevertheless, the
solar wind speed stayed bellow 390 km/s and as such it does not classify as
a fast solar wind. 

	The geomagnetic conditions were mostly quiet with only three intervals of
unsettled conditions, i.e. Dourbes reported K=3 in the midday of January
15, 16 and 17, NOAA also reported interval of Kp=3 on January 16.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2020 Jan 13   000    000   072   003   ////   0   0   
2020 Jan 14   000    000   072   002   ////   0   0   
2020 Jan 15   000    000   071   004   ////   0   0   
2020 Jan 16   000    000   072   004   ////   0   0   
2020 Jan 17   000    000   070   002   ////   0   0   
2020 Jan 18   ///    000   071   003   ////   0   0   
2020 Jan 19   ///    000   072   001   ////   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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