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 May 10 1515 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 1114 from 2022 May 02
SOLAR ACTIVITY
---------------
Solar flaring activity ranged between low and high levels over the week.
Nearly all the flaring activity was associated with two regions: NOAA AR
3004 and NOAA AR 3006. NOAA AR 3006 produced five M-flares and an X flare
between May 03 and May 05. The X1.1 flare occurred on May 04, peaking at
13:25 UT. The X-flare and two of the M-flares originated from beyond the
east limb before the region had rotated onto the solar disk and was
numbered. NOAA AR 3004 began to emerge on May 02, near the central meridian
and developed quickly, producing four M-class flares between May 04 and May
05. Towards the end of the week, the flaring activity decreased to low
levels with both regions continuing to produce C-class flares. On May 08 a
new region beyond the east limb produced a C6 flare and was later numbered
as NOAA AR 3007.

There were multiple filaments observed on disk over the week. A dimming was
observed on May 03 near the central meridian. An associated faint, slow
Coronal Mass Ejections (CME) seen in LASCO-C2 on May 03 from 18:00 to the
north east was considered to possibly have an Earth directed component and
was predicted to impact Earth on May 07. On May 06, a filament eruption in
the north east quadrant, seen in SDO/AIA 304 from 20:00 UT, was linked to a
broad faint CME to the north east seen in LASCO C2 from 21:24 UT. This was
not initially considered Earth directed but then considered to possibly
have a glancing blow at Earth on the second half of May 10.  No other
Earth-directed Coronal Mass Ejections (CMEs) were detected in the available
coronagraph imagery. 

The greater than 10 MeV proton flux was at nominal. The greater than 2MeV
electron flux oscillated around the 1000 pfu threshold for most of the
week. The 24h electron fluence was at normal to moderate levels.
GEOMAGNETIC ACTIVITY
---------------------
At the start of the week the solar wind speed was near 500 km/s and
gradually decreased over the week and reflected a slow solar wind regime.
The total magnetic field magnitude fluctuated around 5 nT during the week,
increasing slightly to values near 9 nT on May 08. The interplanetary
magnetic field phi angle was predominantly in the negative sector (directed
towards the Sun).

Geomagnetic conditions were quiet for the whole week with just a few local
unsettled intervals (NOAA Kp 0-2, Local K Bel 0-3).
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2022 May 02   038    035   112   007   B5.9   0   0   
2022 May 03   130    082   114   007   B5.8   1   1   
2022 May 04   115    077   130   008   B9.6   5   0   
2022 May 05   094    074   120   004   B8.7   2   0   
2022 May 06   ///    074   119   006   B6.9   0   0   
2022 May 07   ///    062   118   002   B5.3   0   0   
2022 May 08   ///    076   119   008   B4.8   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 
03  0734  0753 0801 ////// M1.3          ///////      III/1 

03  1309  1325 1331 S16E05 X1.1 SF       96/3004      

04  0008  0019 0025 ////// M5.3          ///////      

04  0845  0859 0910 S16W09 M5.7 1B  32   96/3004      

04  1625  1632 1640 S16W11 M1.1 1N       96/3004      

04  1940  1948 2003 ////// M1.5          ///3006      

04  2009  2027 2036 ////// M1.6          96/3004      

05  1308  1316 1322 S16W24 M2.2 SN       96/3004      

05  1402  1410 1414 S29E64 M2.7 SF       99/3006      

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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.