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 Aug 22 0830 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 868 from 2017 Aug 14
SOLAR ACTIVITY
---------------
The week started with NOAA AR 2671 rotating into view and producing
numerous C-class flares. The region grew in size and complexity (evolved
into beta gamma delta configuration by August 17, and went back to beta
gamma on the day after), but did not produce any flare between 16 and 18
August. On August 18, NOAA AR 2672 (beta magnetic field configuration)
started to produce C-class flares as it rotated into view. On August 20 it
produced an M1.1 flare peaking at 01:52 UT, this was the strongest flare of
the week. No Earth-directed CMEs were observed.
GEOMAGNETIC ACTIVITY
---------------------
Geomagnetic conditions were quiet until August 17 when the fast speed
stream from a positive polarity coronal hole (in the northern hemisphere)
arrived to the Earth and produced K up to 4 locally at Dourbes, whereas at
planetary levels Kp reached 5. The speed reached 780 km/s with
interplanetary magnetic field magnitudes up to 13 nT. The disturbed
geomagnetic conditions lasted until the end of the week.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Aug 14   ///    008   073   006   B1.0   0   0   
2017 Aug 15   ///    021   074   004   B1.0   0   0   
2017 Aug 16   ///    030   077   008   B1.3   0   0   
2017 Aug 17   ///    040   077   026   A8.3   0   0   
2017 Aug 18   ///    042   080   027   B1.3   0   0   
2017 Aug 19   ///    049   087   031   B3.3   0   0   
2017 Aug 20   ///    059   086   023   B3.3   1   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 
20  0136  0152 0203 ////// M1.1          ///2672      

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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.