SIDC Weekly Bulletin

:Issued: 2018 Jul 16 1558 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 915 from 2018 Jul 09
SOLAR ACTIVITY
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Over the past week solar activity was low. No significant flares have been
recorded. Catania group 89 was the only sunspot region on the visible side
of the Sun that produced B1.5 and B1.3 flare on 10-Jul-2018. The greater
than 10 MeV proton flux
remained at background levels throughout the week. No Earth directed CMEs
were detected. There were no significant coronal holes on the solar disk,
except one small region of negative polarity coronal hole which crossed
central meridian on 13-July-2018.
GEOMAGNETIC ACTIVITY
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The solar wind speed has fluctuated between 500 and 310 km/s over the past
week. At the start of the week the total magnetic field strength fluctuated
between 2 and 5 nT, but jumped to around 13 nT on 13-Jul-2018.
Simultaneously Bz component jumped to around +7 nT. The jump is attributed
to the predicted CME arrival departed from the East solar limb on
05-Jul-2018. Geomagnetic conditions ranged between Kp index 0-3 (NOAA) and
local K index 0-3 (Dourbes).
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2018 Jul 09   000    000   073   003   A3.2   0   0   
2018 Jul 10   000    000   073   010   A2.9   0   0   
2018 Jul 11   000    000   073   012   A2.9   0   0   
2018 Jul 12   000    000   072   009   A2.2   0   0   
2018 Jul 13   017    000   073   008   A3.1   0   0   
2018 Jul 14   ///    000   072   005   A3.2   0   0   
2018 Jul 15   ///    000   072   005   A2.9   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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