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: 2019 Jan 14 1604 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 941 from 2019 Jan 07
SOLAR ACTIVITY
---------------
The solar activity has been very low over the past week. On Jan 07, a small
B-flare was observed at 10:23 UT coming from the Catania sunspot groups 5
(NOAA active region 2732). On the same day, the sunspot turned around the
west limb, and the visible solar disc remained spotless with the X-ray flux
remaining below B-level for the rest of the week. 

Some few narrow and slow solar Coronal Mass Ejections have been observed at
the limb but no Earth directed component was identified. The greater than
10 MeV solar protons flux remained at nominal levels.
GEOMAGNETIC ACTIVITY
---------------------
Earth environment intermittently underwent influence of slightly enhanced
solar wind due to three different equatorial coronal holes of negative
polarity that transited the central meridian on  Dec 31, Jan 08, and Jan
10. During the week, the wind speed ranged between 289 and 566 km/s. Total
interplanetary magnetic field strength fluctuated mainly around 6 nT and
reached 10 nT on Jan 13. The southward magnetic component fluctuated
between -7.0 and 5.8 nT. 

The geomagnetic conditions were mostly quiet over the past week. On Jan 11
at 06:00 UT,  the geomagnetic conditions was active (Kp-index = 4) for a
3-hour period in response to the enhanced interplanetary magnetic field and
prolonged periods of southward directed Bz component.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2019 Jan 07   000    000   072   007   A1.6   0   0   
2019 Jan 08   000    000   071   006   ////   0   0   
2019 Jan 09   ///    000   072   005   ////   0   0   
2019 Jan 10   ///    000   070   003   ////   0   0   
2019 Jan 11   ///    000   068   007   ////   0   0   
2019 Jan 12   ///    000   070   002   ////   0   0   
2019 Jan 13   ///    000   069   003   ////   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.