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

Archive

Latest issue

:Issued: 2017 May 22 1324 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 855 from 2017 May 15
SOLAR ACTIVITY
---------------
The GOES X-ray background was below B1 level throughout the week. The only
sunspot regions were NOAA AR 2656 (alpha, beta), 2657 (alpha) and 2658
(beta), which produced only a few low B flares.
GEOMAGNETIC ACTIVITY
---------------------
A high speed stream from a positive coronal hole arrived at Earth near
midday on May 15, with maximum solar wind speed of about 680 km/s and
maximal magnitude of the Interplanetary Magnetic Field (IMF) around 17 nT.
Late on May 17, enhanced IMF and low solar wind temperature were
registered, probably due to a glancing blow from the CME of May 13. High
speed stream influence waned from May 17 onwards. Since there were no
periods with consistent southward Bz, only a few active geomagnetic periods
(K Dourbes = 4) were registered. A high speed stream from a negative
equatorial coronal hole arrived late on May 18, with maximum solar wind
speed of about 750 km/s and maximal magnitude of the Interplanetary
Magnetic Field (IMF) around 15 nT. Several intervals with active
geomagnetic conditions were recorded.
---------------------------------------------------------------------------
DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 May 15   ///    000   071   014   A3.9   0   0   
2017 May 16   027    024   072   010   A4.2   0   0   
2017 May 17   044    012   071   009   A4.8   0   0   
2017 May 18   025    023   072   011   A5.4   0   0   
2017 May 19   028    023   072   016   A5.0   0   0   
2017 May 20   ///    030   072   024   A5.0   0   0   
2017 May 21   ///    032   074   010   A5.6   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)
---------------------------------------------------------------------------

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
NONE
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center - RWC Belgium                #
# Royal Observatory of Belgium                                       #
# Fax : 32 (0) 2 373 0 224                                           #
# Tel.: 32 (0) 2 373 0 491                                           #
#                                                                    #
# For more information, see http://www.sidc.be.  Please do not reply #
# directly to this message, but send comments and suggestions to     #
# 'sidctech@oma.be'. If you are unable to use that address, use      #
# 'rvdlinden@spd.aas.org' instead.                                   #
# To unsubscribe, visit http://sidc.be/registration/unsub.php        #
#                                                                    #
# Legal notices:                                                     #
# - Intellectual Property Rights:                                    #
#   http://www.astro.oma.be/common/internet/en/data-policy-en.pdf    #
# - Liability Disclaimer:                                            #
#   http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf     #
# - Use and processing of your personal information:                 #
#   http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf #
#--------------------------------------------------------------------#

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.