:Issued: 2011 May 17 1628 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 541 from 2011 May 09
SOLAR ACTIVITY
-------------
Solar activity was rather low during the week, with only C-class flares. The strongest one was a C5.4 flare, occurring on May 9th at 2059 UT (peak time). It was associated with an active region, at that time behind the East limb, an EUV wave and a partial halo CME as seen from Earth. The 10.7 cm flux decreased to rather low levels (91 SFU on May 14th) compared to the past few weeks.
GEOMAGNETIC ACTIVITY
-------------------
Geomagnetic activity was very low during the week, with only
a brief period of active conditions on May 15th (15-18UT),
as the Earth entered a fast solar wind stream linked to a
coronal hole.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 May 09 111 055 104 005 B2.9 0 0
2011 May 10 121 055 98 014 B1.9 0 0
2011 May 11 092 043 94 007 B1.5 0 0
2011 May 12 055 025 93 003 B1.3 0 0
2011 May 13 /// 021 92 004 B1.2 0 0
2011 May 14 /// 033 91 006 B1.1 0 0
2011 May 15 /// 037 95 014 B1.3 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 #
#--------------------------------------------------------------------#
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 541 from 2011 May 09
SOLAR ACTIVITY
-------------
Solar activity was rather low during the week, with only C-class flares. The strongest one was a C5.4 flare, occurring on May 9th at 2059 UT (peak time). It was associated with an active region, at that time behind the East limb, an EUV wave and a partial halo CME as seen from Earth. The 10.7 cm flux decreased to rather low levels (91 SFU on May 14th) compared to the past few weeks.
GEOMAGNETIC ACTIVITY
-------------------
Geomagnetic activity was very low during the week, with only
a brief period of active conditions on May 15th (15-18UT),
as the Earth entered a fast solar wind stream linked to a
coronal hole.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 May 09 111 055 104 005 B2.9 0 0
2011 May 10 121 055 98 014 B1.9 0 0
2011 May 11 092 043 94 007 B1.5 0 0
2011 May 12 055 025 93 003 B1.3 0 0
2011 May 13 /// 021 92 004 B1.2 0 0
2011 May 14 /// 033 91 006 B1.1 0 0
2011 May 15 /// 037 95 014 B1.3 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 #
#--------------------------------------------------------------------#