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: 2012 May 21 1622 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 594 from 2012 May 14  

SOLAR ACTIVITY
--------------

One M-class flare was detected during the week, an M5.1 event on May 17 peaking 
at 01:47 UT from NOAA AR 1476. This flare was related to a proton event and a 
CME with an Earth directed component and type II and III radio bursts. The rest
 of the week presented low solar activity with minor C-class flares. A CME that 
erupted on May 18 from AR 1482 may arrive to the Earth on May 21-22 (estimated 
speed of 500 km/s).


GEOMAGNETIC ACTIVITY
---------------------

On May 15 an ICME arrived to the Earth, most probably coming from an eruption
 on May 12, but did not cause any geomagnetic consequences. On May 20 at 01:44
UT 
a shock coming from the CME on May 17 was detected at ACE, without geomagnetic 
consequences (it produced active conditions at planetary levels Kp=4, but only
k=2 
at Dourbes)


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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2012 May 14   ///    080   130   004   B4.3   0   0
2012 May 15   ///    085   129   004   B4.9   0   0
2012 May 16   175    093   131   012   B4.5   0   0
2012 May 17   ///    077   136   005   B6.5   1   0
2012 May 18   093    075   132   011   B4.5   0   0
2012 May 19   140    074   131   006   B3.5   0   0
2012 May 20   ///    083   131   014   B3.4   0   0
# 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
DAY BEGIN MAX  END  LOC    XRAY OP TENCM TYPE                       Cat NOAA
NOTE 
17  0125  0147 0214 N11W76 M5.1 1F 540   II/3,IV/2,III/3                1476 

 
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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.