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

Archive

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:Issued: 2019 Apr 15 1457 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 954 from 2019 Apr 08
SOLAR ACTIVITY
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Over the past week solar activity was low. The largest flare was a B7.1
class flare, which peaked at 11:37 UT on 12-Apr-2018. Active Region (AR)
2738 was the only significant region on the solar disk and produced all of
the flaring activity, showing some evidence of flux emergence and
cancellation in HMI magnetogram observations. No significant filament
channels were seen on the solar disk. A back-sided filament eruption
(STEREO-A Observations) emerging from near the south polar coronal hole
occurred around 14:30 UT on 11-Apr-2019. The eruption was seen as a small
Coronal Mass Ejection (CME) emerging to the south-east of the solar disk in
LASCO observations. The eruption had no Earth directed component. No Earth
directed CMEs have been detected. The greater than 10MeV proton flux
remained at background levels throughout the week. Solar activity is
expected to remain low over the next few days with a small chance of a
C-class flare from AR 2738.
GEOMAGNETIC ACTIVITY
---------------------
The solar wind speed has fluctuated between 380 and 480 km/s over the past
week. The total magnetic field strength has fluctuated between 3.5 and 8.0
nT, peaking on 08-Apr-2019. The Bz component has fluctuated between -8 and
+7 nT.  Geomagnetic conditions ranged between Kp index 1-4 (NOAA) and local
K index 0-3 (Dourbes). Kp reached 4 on a couple of occaisions when the Bz
reached values around -8 nT. Geomagnetic activity is expected to be at low
levels next week, as no Earth directed CMEs or significant low latitde
coronal holes have been detected.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2019 Apr 08   013    013   079   014   A6.0   0   0   
2019 Apr 09   ///    013   079   010   A6.0   0   0   
2019 Apr 10   ///    014   078   015   A2.2   0   0   
2019 Apr 11   ///    014   077   007   A2.4   0   0   
2019 Apr 12   ///    015   077   008   A2.4   0   0   
2019 Apr 13   ///    016   078   010   A2.8   0   0   
2019 Apr 14   ///    015   075   005   ////   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.