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

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:Issued: 2021 Oct 18 1255 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 1085 from 2021 Oct 11
SOLAR ACTIVITY
---------------
The GOES X-ray flux background varied between A6 and B1 level. NOAA regions
2882, 2883, 2884 and 2885 were on the visible hemisphere of the Sun.
Beta-gamma region 2882 produced several high B flares and beta region 2885
released 3 low C flares. The Sun produced no M or X flares.

No Earth-directed Coronal Mass Ejections were observed in available
coronagraphic imagery. 

The greater than 10 MeV proton flux was at nominal levels throughout the
week. The greater than 2 MeV electron flux briefly reached moderate levels
on October 15 and was nominal throughout the rest of the week, while the
greater than 2 MeV electron fluence was nominal throughout the week.
GEOMAGNETIC ACTIVITY
---------------------
An ICME arrived near Earth around 01:45 UT on October 12, leading to a
maximum solar wind speed of about 515 km/s and a maximal Interplanetary
Magnetic Field (IMF) magnitude of about 16 nT. This ICME was probably
associated with the halo CME and M1.6 flare of October 9. The solar wind
was nominal from October 14 onwards.

Geomagnetic indexes reached minor storm levels (K Dourbes = 5, NOAA Kp = 6)
during a few intervals on October 12, and were mostly quiet to unsettled (K
Dourbes < 4) throughout the rest of the week.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2021 Oct 11   041    028   089   ///   B1.0   0   0   
2021 Oct 12   028    015   084   ///   A8.9   0   0   
2021 Oct 13   026    018   084   ///   A7.4   0   0   
2021 Oct 14   ///    019   083   ///   A7.1   0   0   
2021 Oct 15   011    011   084   ///   A5.3   0   0   
2021 Oct 16   ///    011   078   ///   A5.9   0   0   
2021 Oct 17   ///    000   077   ///   A4.9   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.