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 Jan 25 0840 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 1099 from 2022 Jan 17
SOLAR ACTIVITY
---------------
The week started with 8 active regions, out of which only NOAA AR 2929 and
2930 produced C-class flares. The former produced 2 M class flares also
(M1.5 on 18 January and M5.5 on 20 January), both associated with CMEs.
There were CMEs with an Earth directed component on 15, 16 and 18 January.
A positive polarity equatorial coronal hole crossed central meridian on 21
January. At the end of the week, only 2 active regions were visible, and
solar activity was low.

The greater than 10 MeV proton flux passed the threshold of 10 pfu on 20
January (due to the M5.5 flare and CME), for about half a day, then
returned to nominal values. The greater than 2 MeV electron flux increased
above the 1000 pfu alert threshold every day of the week (going back to
nominal levels daily). The electron fluence was at normal to moderate
levels.
GEOMAGNETIC ACTIVITY
---------------------
The Earth was under the influence of a high speed stream at the beginning
of the week, until 20 January (with speeds close to 700 km/s) when the
solar wind speed decreased below 500 km/s for the rest of the week. There
were ICME arrivals on 17 January (CME from 14/1, K_Bel = 4, Kp = 5), on 18
January (CMEs from 15-16/1, K_Bel = 5, Kp = 6) and on 21 January (CME from
18 January, K_Bel = 3, Kp = 3).
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2022 Jan 17   107    080   114   012   B3.1   0   0   
2022 Jan 18   082    064   115   018   B2.5   1   0   
2022 Jan 19   058    058   105   023   B2.1   0   0   
2022 Jan 20   075    058   099   004   B2.1   1   0   
2022 Jan 21   036    023   097   012   B1.4   0   0   
2022 Jan 22   ///    022   095   013   B1.2   0   0   
2022 Jan 23   ///    019   094   008   A9.8   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 
18  1701  1744 1817 N09W54 M1.5 SF  150  06/2929      II/1IV/1 

20  0541  0601 0612 N08W68 M5.5 1F  350  06/2929      V/3II/2 

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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.