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: 2019 Jun 17 1340 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 963 from 2019 Jun 10
SOLAR ACTIVITY
---------------
Solar activity was at very low levels. The Sun has been spotless since 30
May (SILSO). This ongoing spotless stretch of already 19 consecutive days
is the longest one so far this solar cycle minimum. No earth-directed
coronal mass ejections (CMEs) were observed. The greater than 10 MeV proton
flux was at nominal levels. An extension from the positive polarity polar
coronal hole (CH) transited the central meridian (CM) on 8 June. A diffuse
and patchy negative polarity CH transited the CM from late on 12 till 16
June.
GEOMAGNETIC ACTIVITY
---------------------
The earth environment was dominated by the solar wind stream from the
positive polarity coronal hole (CH) which arrived at 12 June. Solar wind
speed gradually increased from 300 to near 500 km/s on 14 June, ending the
period near 330 km/s (DSCOVR). Bz varied between -7 and +7 nT. The
direction of the IMF switched from towards (negative sector) to mostly away
from the Sun (positive sector) early on 12 June. Before 12 and after 15
June, the solar wind was at nominal levels. By the end of the period, the
wind stream of the negative CH had not arrived yet.   

Quiet to unsettled geomagnetic conditions were observed throughout the week
(Kp and K Dourbes), with a single active episode for the Kp-index late on
13 June.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2019 Jun 10   000    000   069   004   A6.8   0   0   
2019 Jun 11   000    000   070   002   A7.0   0   0   
2019 Jun 12   000    000   070   005   A6.9   0   0   
2019 Jun 13   000    000   068   012   A6.9   0   0   
2019 Jun 14   ///    000   068   007   A6.9   0   0   
2019 Jun 15   ///    000   067   004   A6.7   0   0   
2019 Jun 16   ///    000   066   004   A6.5   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.