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: 2017 Feb 20 1252 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 842 from 2017 Feb 13
SOLAR ACTIVITY
---------------
The GOES X-ray background was near A7 level until February 17, when it
gradually rose to about B1 level. From the start of the week, beta region
NOAA AR 2635 was visible until it rotated behind the west limb as an alpha
region. Alpha region AR 2636 emerged on February 16 and became a beta
region on February 18. None of these regions produced any flaring above B4
level. A filament eruption was observed west of NOAA AR 2636 in
ground-based H alpha images and HeII AIA images around 5:20 UT on February
19. The associated CME was very faint and is not expected to be Earthbound.
GEOMAGNETIC ACTIVITY
---------------------
The week has been geomagnetically quiet until the arrival of the high speed
stream from a positive coronal hole near 6:20 UT on February 16. Solar wind
speed increased to peak values near 620 km/s on February 19, while the
magnitude of the Interplanetary Magnetic Field (IMF) varied between about 1
and 13 nT. Since there were no extended periods when the Bz component of
the IMF was below -5 nT, the geomagnetic effect of the high speed stream
was limited to some active intervals (K Dourbes = 4).
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Feb 13   ///    017   075   008   A6.3   0   0   
2017 Feb 14   ///    016   075   001   A6.2   0   0   
2017 Feb 15   ///    023   075   002   A5.9   0   0   
2017 Feb 16   025    013   074   008   A5.7   0   0   
2017 Feb 17   012    013   075   022   A7.6   0   0   
2017 Feb 18   ///    012   077   020   B1.0   0   0   
2017 Feb 19   ///    022   078   014   B1.4   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 
NONE
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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.