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SIDC Weekly Bulletin

:Issued: 2009 Dec 07 1347 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 466 from 2009 Nov 30

SOLAR ACTIVITY
————–
Solar activity was at its lowest level during the whole week.
The Earth was facing the inactive hemisphere of the Sun. Indeed,
over the last 8 Carrington rotations, almost all active regions
appeared in restricted longitude ranges, mostly 200 – 300° and also
0 – 50°. So, all recent active regions were on the far side of the
Sun during this week.

As unique event, a limb CME was observed at the West limb on Dec.3.
A small low-latitude coronal hole rotated in a geoeffective position
late in the week by Dec.5.
Also, on Dec.1st, the transition from GOES10 to GOES14 led to a
jump in the X-ray flux measurements that is only due to a difference
in the sensitivity of the instruments.

GEOMAGNETIC ACTIVITY
——————–
The geomagnetic activity remained quiet over the entire week, with
only a brief unsettled interval on Dec.5, associated to a weak
solar wind disturbance produced by a small low-latitude coronal
hole.
The highlight of this week was an extremely quiet period from Dec.3
to Dec.5, when the solar wind parameters all reached exceptionally
low values: speed < 250km/s, density < 0.3 electron/cm3, temperature
< 20000K and magnetic field strength < 4nT. Given the vanishing
and stable dynamic pressure of the solar wind on the Earth
magnetosphere, the corresponding geomagnetic indices stayed mostly
at Kp=0 in most ground stations from Dec.1 to Dec.5.

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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2009 Nov 30 000 000 72 002 A0.0 0 0
2009 Dec 01 000 000 72 000 A1.4 0 0
2009 Dec 02 000 000 71 001 A1.4 0 0
2009 Dec 03 000 000 72 000 A1.4 0 0
2009 Dec 04 /// 000 72 000 A1.4 0 0
2009 Dec 05 /// 000 72 004 A0.0 0 0
2009 Dec 06 /// 000 72 004 A0.0 0 0
# 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
DAY BEGIN MAX END LOC XRAY OP TENCM TYPE Cat NOAA NOTE

#——————————————————————–#
# Solar Influences Data analysis Center – RWC Belgium #
# Royal Observatory of Belgium #
# Fax : 32 (0) 2 373 0 224 #
# Tel.: 32 (0) 2 373 0 491 #
# #
# For more information, see http://www.sidc.be.
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