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: 2024 Mar 18 1309 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 1211 from 2024 Mar 11

Solar Active Regions (ARs) and flares
---------------
There were 15 active regions visible throughout the week. Only NOAA AR 3599
evolved into a complex magnetic field configuration (beta-gamma-delta) and
created most of the flaring during the week. The other active regions had
simple magnetic field configuration (alpha or beta). By the end of the
week, with NOAA AR 3599 out of view, the flaring activity shifted to NOAA
AR 3612 and to two active regions rotating into view from the east limb
(one unnumbered and NOAA AR 3614).

Coronal mass ejections
---------------------
An M7.4 flare from NOAA AR 3599 on 10 March was related to dimmings and an
EUV wave and CME directed towards the west. The CME was not very wide
(apparent angular width of about 70 degrees) and speed close to 500 km/s.
On 13 March, a partial halo CME with angular width around 150 degrees was
first seen by LASCO C2 at 08:57 UT. There are no signatures of an eruption
on the visible solar disk, so this CME was deemed backsided.
On 14 March we observed a partial halo CME, seen by LASCO C2 at 05:08 UTC,
with an angular width of about 140 degrees, directed towards the east. This
eruption occurred close to the limb but was mostly backsided
On 15 March, one more partial halo CME was observed by LASCO C2 at 02:10
with an angular width of 150 degrees and directed towards the west (related
to flaring activity from NOAA AR 3599 over the west limb). This eruption
also occurred close to the limb and was mostly backsided.
On 17 March, a partial halo CME (angular width about 180 degrees) was
observed,  directed towards the south, first seen at 03:24 UTC by LASCO C2.
This CME originated from a filament eruption in the southern hemisphere.

Coronal Holes
---------------------
An equatorial (positive polarity) coronal hole crossed the central meridian
on 10 March.

Proton flux levels
---------------------
The partial halo CME from 15 March was associated with an increase in the
10 MeV proton flux at Earth; it crossed the 10 pfu threshold and remained
elevated during 16 March. It is still slowly returning to background levels
at the moment of writing (but below the threshold). The rest of the week
the proton flux was at background levels.

Electron fluxes at GEO
---------------------
The greater than 2 MeV electron flux was below the threshold level, except
on 10-11 March when it was slightly above it. The electron fluence was at
normal levels throughout the week.

Solar wind
---------------------
The solar wind was slow the entire week, with speeds below 500 km/s and
interplanetary magnetic field below 10 nT.

Geomagnetism
---------------------
The geomagnetic conditions were quiet to unsettled the whole week, both
locally and globally, except for a brief interval on 15 March that reached
active levels.

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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2024 Mar 11   108    074   127   004   B4.4   0   0   
2024 Mar 12   116    082   131   006   B4.8   0   0   
2024 Mar 13   093    081   128   009   B4.7   0   0   
2024 Mar 14   091    071   127   009   B8.0   1   0   
2024 Mar 15   052    051   129   008   C1.0   0   0   
2024 Mar 16   ///    058   144   002   C1.0   2   0   
2024 Mar 17   ///    084   151   001   C1.6   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 
14  0552  0604 0611 S11W82 M1.0 SF       99/3599      III/1VI/1 

16  1622  1635 1644 ////// M3.5          ///////      

16  2127  2155 2211 ////// M1.1          ///////      

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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.