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: 2022 Nov 29 2320 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 1143 from 2022 Nov 21
SOLAR ACTIVITY
---------------
During this week 7 active regions were observed on the visible side of the
solar disc, as seen from Earth. The solar flaring activity resulted in only
14 C-class flares reported by GOES. The strongest flare observed this week
was the GOES C7.0 flare, which peaked at 07:27 UT on November 22. The
associated CME was about only100 degrees wide, and was therefore not
expected to arrive to Earth.

There were no potentially Earth-directed CMEs detected in the available
coronagraph observations this week.

During this week two small, positive polarity coronal holes were observed
(reaching central meridian late on November 21 and November 23), and one
patchy, but extended in latitude and longitude, also positive polarity
coronal hole that crossed central meridian on November 27. 

The greater than 10 MeV proton flux was at background level during the
whole week. The greater than 2 MeV electron flux was most of the week
bellow the threshold value of 1000 pfu, and only one interval with the
value crossing the threshold of 1000 pfu was observed on November 28.
Similarly, the 24h electron fluence was most of the time at normal level
and in the last day of the week at moderate level.
GEOMAGNETIC ACTIVITY
---------------------
During first half of this week the Earth was inside the slow solar wind.
The arrival of the fast solar wind associated with the two positive
polarity coronal holes (reached central meridian on November 21 and 23),
was observed starting from afternoon of November 25 and morning of November
27, respectively.

The geomagnetic conditions were during major part of the week mostly quiet
to unsettled with the one interval of active geomagnetic conditions on
November 28. The unsettled to active geomagnetic conditions in the last
three days of the week were associated with the arrival of fast solar wind
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2022 Nov 21   108    073   117   010   B4.8   0   0   
2022 Nov 22   ///    062   116   002   B5.2   0   0   
2022 Nov 23   050    062   113   002   B2.6   0   0   
2022 Nov 24   061    066   110   006   B3.7   0   0   
2022 Nov 25   066    060   109   021   B3.0   0   0   
2022 Nov 26   ///    068   107   018   B3.0   0   0   
2022 Nov 27   ///    064   107   019   B3.8   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.