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: 2018 Feb 19 1541 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 894 from 2018 Feb 12
SOLAR ACTIVITY
---------------
Over the past week solar activity was low. The largest flare was a C1.5
class flare. Active Region (AR) 2699 was most active, showing considerable
flux emergence and cancellation, producing the C1.5-class flare, which
peaked at 01:35 UT on 12-feb-2018. A halo CME was observed in the
SOHO/LASCO C2 field of view at 01:25 UT on 2018-Feb-12. The CME had a speed
of approximately 509 km/s and reached the Earth on 15-Feb-2018 at
approximately 16:00 UT. The source region of the CME was NOAA AR 2699 which
was near disk centre. The greater than 10MeV proton flux remained at
background levels throughout the week.
GEOMAGNETIC ACTIVITY
---------------------
Over the past week the solar wind speed increased from around 250 to around
650 km/s. The total magnetic field strength fluctuated between 3 and 15 nT,
peaking on 16-Feb-2018. The Bz component has fluctuated between -15 and +15
nT. Geomagnetic conditions ranged between Kp index 0-4 (NOAA) and local K
index 0-4 (Dourbes) over the past week. A small negative polarity coronal
hole passed the central meridian at the beginning of the week and the
resulting High Speed Stream (HSS) caused enhancements in solar wind speeds
and geomagnetic activity in the second half of the week. The halo CME
produced on 2018-Feb-12 created a shock, first observed on 15-Feb-2018 in
DSCOVR observations, and enhanced solar wind speeds at Earth, causing
enhanced geomagnetic conditions which reached Kp index 4 (NOAA) and local K
index 4 (Dourbes).
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2018 Feb 12   021    028   079   004   B1.0   0   0   
2018 Feb 13   ///    026   076   003   A5.8   0   0   
2018 Feb 14   ///    022   075   003   A5.0   0   0   
2018 Feb 15   ///    017   073   020   A4.7   0   0   
2018 Feb 16   016    014   072   008   A4.3   0   0   
2018 Feb 17   ///    000   069   014   A4.3   0   0   
2018 Feb 18   ///    000   070   015   A3.6   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.