SIDC Weekly Bulletin

:Issued: 2025 Mar 17 1246 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 1263 from 2025 Mar 10

Solar Active Regions (ARs) and flares
---------------
Solar flaring activity was low to moderate during the week. A total of 48
C-class flares and 2 M-class flares were observed. The largest flares were
two M1.1 flares, one peaking on March 11 at 13:04 UTC (SIDC Sunspot Group
431/NOAA Active Region 4024) and the second peaking on March 14 at 22:21
UTC (SIDC Sunspot Group 437/NOAA Active Region 4030). There were a total
number of 22 active regions observed on the visible solar disk over the
week. The number of active regions on disk increased from 5 to 13 during
the week.

Coronal mass ejections
---------------------
During the past week, no CME (Coronal Mass Ejection) with an Earth directed
component was observed.

Coronal Holes
---------------------
During past week, two negative polarity Coronal Hole (CH) crossed the
central meridian on March 10, resp. on March 14 2025.

Proton flux levels
---------------------
The greater than 10 MeV GOES proton flux was below the 10pfu threshold for
the entire week.

Electron fluxes at GEO
---------------------
The greater than 2 MeV electron flux was above the 1000 pfu threshold for
almost the entire week.

Solar wind
---------------------
In the beginning of the week the solar wind at Earth transitioned from fast
to slow, then on the March 12 the solar wind became fast again and returned
to slow solar wind conditions on March 15.  The solar wind ranged between
350 and 600 km/s and the interplanetary magnetic field was between 4 and 12
nT, and with the Bz reaching a minimum value of -11 nT.

Geomagnetism
---------------------
Geomagnetic conditions reached minor storm (KP5) on March 12 till March 14,
with an isolated period of moderate storm on March 14 (Kp 6), and have
since then returned to quiet conditions.

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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2025 Mar 10   111    104   149   009   B8.0   0   0   
2025 Mar 11   ///    140   161   009   C1.0   1   0   
2025 Mar 12   ///    157   160   029   C1.2   0   0   
2025 Mar 13   ///    167   175   031   C1.1   0   0   
2025 Mar 14   221    175   180   022   C1.2   1   0   
2025 Mar 15   ///    167   178   014   C1.1   0   0   
2025 Mar 16   ///    205   186   011   C1.1   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 
11  1303  1304 1306 ////// M1.1          ///4024      III/2 

14  2218  2221 2232 ////// M1.1          ///4030      

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