SIDC Weekly Bulletin

:Issued: 2019 Aug 19 1121 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
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WEEK 972 from 2019 Aug 12
SOLAR ACTIVITY
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There were no active regions visible on the solar disk during the week. No
flares were observed. There were no Earth-directed CMEs and the greater
than 10 MeV proton flux was at nominal levels throughout the week. 

A diffuse and patchy negative polarity coronal hole (CH) that transited the
central meridian (CM) on 7 August did not have any significant impact on
space weather parameters. An irregularly shaped negative polarity CH
transited CM on 15 August.
GEOMAGNETIC ACTIVITY
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The solar wind speed gradually decreased from about 500 km/s till 350 km/s
over the past week. The total interplanetary magnetic field averaged around
5 nT most of the time, except two intervals of B = 7 nT (13 August) and B =
8 nT (18 August), in both cases as the result of the coronal holes
influence that transited CM on 7 and 15 August. 

Geomagnetic condition were mostly quiet over the past week except two
isolated episodes of unsettled geomagnetic conditions on 13 and 18 of
August in agreement with the solar wind parameters evolution.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2019 Aug 12   ///    000   067   006   A6.2   0   0   
2019 Aug 13   ///    000   067   010   A6.1   0   0   
2019 Aug 14   ///    000   067   004   A6.2   0   0   
2019 Aug 15   ///    000   067   004   A6.2   0   0   
2019 Aug 16   ///    000   068   006   A6.0   0   0   
2019 Aug 17   ///    000   068   005   A6.0   0   0   
2019 Aug 18   ///    000   068   007   A5.9   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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