SIDC Weekly Bulletin

:Issued: 2024 Dec 02 1618 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 1248 from 2024 Nov 25

Solar Active Regions (ARs) and flares
---------------
The past week started with high solar flaring activity as seven M-class
X-ray flares were detected on 25 Nov. The brightest of those flares was an
M9.4 registered at 07:42 UTC and was located at E90N15. The solar region
responsible for this flare and an M1.5 at 17:07 UTC was later identified as
SIDC Sunspot Group 302 (NOAA Active Region [AR] 3910). The rest of the
M-class flaring activity was associated with the SIDC Sunspot Groups 298
(NOAA AR 2901), 322 (NOAA AR 3905), and 323 (NOAA AR 3906).
Moderate flaring activity was observed again on 27 Nov, as an M1.0 flare
was registered from the location of SIDC sunspot group 298.
For the rest of the week only C-class flares were observed.

Coronal mass ejections
---------------------
A Coronal Mass Ejection (CME) was registered in LASCO-C2/SOHO images on 25
Nov. It arrived at the Earth's atmosphere on 29 Nov.

Coronal Holes
---------------------
A very small equatorial corona hole with positive polarity crossed the
solar central meridian on 28 Nov.

Proton flux levels
---------------------
The greater than 10 MeV proton flux, as measured by the GOES-18 satellite,
was at nominal levels throughout the week.

Electron fluxes at GEO
---------------------
The greater than 2 MeV electron flux as measured by GOES-18 was below the
1000 pfu threshold and the 24h electron fluence was at nominal levels
throughout the week.

Solar wind
---------------------
The Solar Wind (SW) conditions were in general typical of the slow SW
regime during the past week. The SW speed was below 500 km/s, the total
interplanetary magnetic field (Bt) registered values up to 17 nT, and the
North-South magnetic component (Bz) ranged between -10 and 14 nT. The
interplanetary magnetic field phi angle was mostly directed away from the
Sun.
The highest (and the lowest Bz) of those physical quantities were measured
during the arrival of a Coronal Mass Ejection (CME) on 29 Nov at 17:00 UTC
that lasted until 30 Nov 05:30 UTC.

Geomagnetism
---------------------
The global and local geomagnetic conditions were generally quiet during the
past week. The only noticeable exception was the minor storm (NOAA Kp 5-)
registered globally on 30 Nov from 00:00 to 03:00 UTC. The local conditions
of the same day only registered active levels (K BEL 4).

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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2024 Nov 25   ///    167   220   009   C2.9   7   0   
2024 Nov 26   219    160   222   005   C2.0   0   0   
2024 Nov 27   222    205   225   005   C1.8   1   0   
2024 Nov 28   213    170   214   003   C1.8   0   0   
2024 Nov 29   ///    161   220   008   C1.5   0   0   
2024 Nov 30   ///    121   204   012   C1.6   0   0   
2024 Dec 01   ///    121   186   008   C1.4   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 
25  0139  0159 0211 ////// M1.1          15/3906      

25  0439  0453 0459 ////// M1.8          15/3906      

25  0724  0742 0803 ////// M9.4          ///////      III/1 

25  1201  1212 1217 S12E40 M2.0 SF       14/3905      VI/1 

25  1607  1636 1658 ////// M1.0          15/3906      

25  1658  1707 1716 ////// M1.5          ///3910      

25  2024  2054 2123 S09W25 M1.9 2F       03/3901      VI/2 

27  1227  1246 1249 ////// M1.0          03/3901      

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