:Issued: 2011 May 10 1948 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 540 from 2011 May 02
SOLAR ACTIVITY
-------------
The week started with a C6.5 flare (actually just before midnight) from NOAA 11199, then already
rotated over the solar West limb. After that, activity was dominated by a cluster of active regions
(NOAA 11203, 11204 and 11205) in the NE quadrant. A C1.3 flare was released from NOAA11204
on May 3, but activity gradually decreased after that and no more flares of C-class, or higher,
were observed during the period.
An active region (later labeled NOAA11210) with a very extended structure of coronal rays crossed
the solar NE limb on May 4.
>From May 7 onwards an SIDC ALL QUIET ALERT was issued for the rest of the period.
GEOMAGNETIC ACTIVITY
-------------------
The week started with high geomagnetic activity (Kp=5) as a consequence of a high speed solar wind
stream (>600km/s). Solar wind speed and geomagnetic activity decayed monotonically as the period
proceded, down to a solar wind speed of 300km/s and a value of Kp=1.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 May 02 /// 034 110 /// B2.9 0 0
2011 May 03 /// 046 107 018 B2.1 0 0
2011 May 04 106 048 107 006 B2.0 0 0
2011 May 05 098 047 105 008 B1.8 0 0
2011 May 06 049 029 102 004 B1.8 0 0
2011 May 07 /// 023 102 009 B1.8 0 0
2011 May 08 /// 041 102 003 B1.8 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 #
#--------------------------------------------------------------------#
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 540 from 2011 May 02
SOLAR ACTIVITY
-------------
The week started with a C6.5 flare (actually just before midnight) from NOAA 11199, then already
rotated over the solar West limb. After that, activity was dominated by a cluster of active regions
(NOAA 11203, 11204 and 11205) in the NE quadrant. A C1.3 flare was released from NOAA11204
on May 3, but activity gradually decreased after that and no more flares of C-class, or higher,
were observed during the period.
An active region (later labeled NOAA11210) with a very extended structure of coronal rays crossed
the solar NE limb on May 4.
>From May 7 onwards an SIDC ALL QUIET ALERT was issued for the rest of the period.
GEOMAGNETIC ACTIVITY
-------------------
The week started with high geomagnetic activity (Kp=5) as a consequence of a high speed solar wind
stream (>600km/s). Solar wind speed and geomagnetic activity decayed monotonically as the period
proceded, down to a solar wind speed of 300km/s and a value of Kp=1.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 May 02 /// 034 110 /// B2.9 0 0
2011 May 03 /// 046 107 018 B2.1 0 0
2011 May 04 106 048 107 006 B2.0 0 0
2011 May 05 098 047 105 008 B1.8 0 0
2011 May 06 049 029 102 004 B1.8 0 0
2011 May 07 /// 023 102 009 B1.8 0 0
2011 May 08 /// 041 102 003 B1.8 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)
---------------------------------------------------------------------------
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 #
#--------------------------------------------------------------------#