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: 2017 Jul 17 1633 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
#--------------------------------------------------------------------#
WEEK 863 from 2017 Jul 10
SOLAR ACTIVITY
---------------
The firth part of the week started with AR NOAA 2665 developing from Beta
to Beta-Gamma magnetic configuration, NOAA AR 2666 was numbered 13th of
July and NOAA AR 2667 only 15th of July, while rotating over the western
solar limb. The period of elevated solar activity started 13th of July by
NOAA AR producing multiple C flares and narrow coronal mass ejections(CMEs)
- last ones were mainly coming from NOAA AR 2667 directed to the West. The
most geoeffective event of the period was a full halo CME detected by
CACtus, visible in SoHO/LASCO C2 images from 01:25 UT (14th of July). The
CME was initiated by M2.4 class flare (START: 01:07UT; PEAK: 02:09 UT) and
subsequent activity of NOAA 2665 NOAA and 2666 ARs. The posterior analysis
of the CME speed gave 1350 km/s (for 3D speed). Simultaneously the > 10 MeV
and > 50 MeV proton fluxes at 1 AU started rising around 04 UT, the > 10
MeV flux has reached the critical threshold of SEP event 3 hours later, and
the value of 23 pfu around 00UT 15th of July. Protons of >10 MeV gradually
returned to near background level morning 17th of July.
GEOMAGNETIC ACTIVITY
---------------------
Solar wind parameters were at low levels till approximately 05:45 UT, July
16th. Then a halo CME of July 14th has arrived. Solar wind speed jumped
from about 320 km/s to 505 km/s, and total magnetic field strength Bt from
3.5 to 22 nT. The solar wind density increased by 10 times (50 particles
per cm^3) and the temperature by 200 times according to the DSCOVR
measurements. Bz variations increased first from -2/+2 nT till +7/-12 nT
and later Bz decreased till -22 nT. Later total magnetic field declined to
around 10nT around midnight, when also density dropped back to background
values. Solar wind speed reached a maximum of over 600 km/s around 21:00UT
(16th of July) before declining to under 500km/s currently. 

Geomagnetic conditions remained very low levels until halo CME arrived .
Minor (Kp = 5) and moderate (Kp = 6) magnetic storms occurred from 06 UT
till the end of the same day 9(16th of July). Later Kp index returned to
active conditions (Kp=4). Local index at Dourbes was at minor storm levels
(K=4, K=5). Next week is expected to start from the active geomagnetic
conditions.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2017 Jul 10   034    045   095   008   B1.3   0   0   
2017 Jul 11   041    039   091   010   B1.3   0   0   
2017 Jul 12   072    061   090   004   B1.6   0   0   
2017 Jul 13   050    061   092   004   B1.4   0   0   
2017 Jul 14   052    055   094   003   B5.6   1   0   
2017 Jul 15   ///    032   092   005   B1.9   0   0   
2017 Jul 16   ///    021   087   043   B2.1   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 
14  0107  0209 0324 S06W29 M2.4 1N  130  36/2665      IV/1 

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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.