:Issued: 2011 Feb 22 1256 UTC
:Product: documentation at http://www.sidc.be/products/bul
#--------------------------------------------------------------------#
# SIDC Weekly bulletin on Solar and Geomagnetic activity #
#--------------------------------------------------------------------#
WEEK 529 from 2011 Feb 14
SOLAR CONDITIONS
---------------
Solar activity ranged from moderate to high during the whole week and it was dominated by NOAA AR 1158. It produced an X2.2 flare peaking at 01:56 UT on February 15. This has been the strongest flare in more than four years. This AR also produced the following M-class flares: M6.6 at 17:38 UT on February 13, M2.2 at 17:26 UT on February 14, M1.0 at 01:39 UT on February 16, M1.6 at 14:25 UT on February 16, M6.6 at 10:11 UT on February 18, M1.4 at 13:03 on February 18. NOAA AR 1161 produced an M1.0 flare at 07:44 UT on February 16. NOAA AR 1162 was active on February 18 with an M1.0 at flare 10:26, an M1.0 flare at 14:08 UT and an M1.3 at 21:04 UT. The M6.6 flare on February 13, the M2.2 on February 14 and the X2.2 on February 15 were associated with Earth directed CMEs and radio bursts
GEOMAGNETIC CONDITIONS
----------------------
On February 14, a shock arrived to ACE and it was followed by strong magnetic fields which created active conditions. This disturbance is believed to have originated on February 9-10 on the Sun. On February 18, the combination of the three Earth directed CMEs described in thesolar section arrived to the Earth and produced a minor geomagnetic storm. A more lasting and powerful geomagnetic effect was not seen due to the absence of a strong long lasting negative Bz. The Earth seems to have gone through a sheath region right after the shock that arrived at 00:40 UT on February 18, until 19:40 UT on the same day. After that the solar wind signatures could be related to a passage through a leg/flank of a magnetic cloud.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Feb 14 107 055 113 019 B5.0 1 0
2011 Feb 15 094 054 113 008 B5.2 0 1
2011 Feb 16 /// 047 114 004 B4.2 3 0
2011 Feb 17 066 038 111 002 B5.8 0 0
2011 Feb 18 /// 051 125 020 B8.1 5 0
2011 Feb 19 071 048 109 006 B5.7 0 0
2011 Feb 20 /// 045 105 010 B3.3 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
14 1720 1726 1732 N56W18 M2.2 1N III/1,II/2 10 1158
15 0144 0156 0206 X2.2 1300 II/2,III/3,IV/2 10 1158
16 0132 0139 0146 M1.0 VI/1 10
16 0735 0744 0755 M1.1 10 1161
16 1419 1425 1429 S20W32 M1.6 1F 330 VI/2,III/2,II/3 10 1158
18 0955 1011 1015 M6.6 III/2 10 1158
18 1023 1026 1037 M1.0 1162
18 1259 1303 1306 M1.4 10 1158
18 1400 1408 1415 M1.0 15 1162
18 2056 2104 2114 M1.3 15 1162
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center #
# 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 529 from 2011 Feb 14
SOLAR CONDITIONS
---------------
Solar activity ranged from moderate to high during the whole week and it was dominated by NOAA AR 1158. It produced an X2.2 flare peaking at 01:56 UT on February 15. This has been the strongest flare in more than four years. This AR also produced the following M-class flares: M6.6 at 17:38 UT on February 13, M2.2 at 17:26 UT on February 14, M1.0 at 01:39 UT on February 16, M1.6 at 14:25 UT on February 16, M6.6 at 10:11 UT on February 18, M1.4 at 13:03 on February 18. NOAA AR 1161 produced an M1.0 flare at 07:44 UT on February 16. NOAA AR 1162 was active on February 18 with an M1.0 at flare 10:26, an M1.0 flare at 14:08 UT and an M1.3 at 21:04 UT. The M6.6 flare on February 13, the M2.2 on February 14 and the X2.2 on February 15 were associated with Earth directed CMEs and radio bursts
GEOMAGNETIC CONDITIONS
----------------------
On February 14, a shock arrived to ACE and it was followed by strong magnetic fields which created active conditions. This disturbance is believed to have originated on February 9-10 on the Sun. On February 18, the combination of the three Earth directed CMEs described in thesolar section arrived to the Earth and produced a minor geomagnetic storm. A more lasting and powerful geomagnetic effect was not seen due to the absence of a strong long lasting negative Bz. The Earth seems to have gone through a sheath region right after the shock that arrived at 00:40 UT on February 18, until 19:40 UT on the same day. After that the solar wind signatures could be related to a passage through a leg/flank of a magnetic cloud.
---------------------------------------------------------------------------
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2011 Feb 14 107 055 113 019 B5.0 1 0
2011 Feb 15 094 054 113 008 B5.2 0 1
2011 Feb 16 /// 047 114 004 B4.2 3 0
2011 Feb 17 066 038 111 002 B5.8 0 0
2011 Feb 18 /// 051 125 020 B8.1 5 0
2011 Feb 19 071 048 109 006 B5.7 0 0
2011 Feb 20 /// 045 105 010 B3.3 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
14 1720 1726 1732 N56W18 M2.2 1N III/1,II/2 10 1158
15 0144 0156 0206 X2.2 1300 II/2,III/3,IV/2 10 1158
16 0132 0139 0146 M1.0 VI/1 10
16 0735 0744 0755 M1.1 10 1161
16 1419 1425 1429 S20W32 M1.6 1F 330 VI/2,III/2,II/3 10 1158
18 0955 1011 1015 M6.6 III/2 10 1158
18 1023 1026 1037 M1.0 1162
18 1259 1303 1306 M1.4 10 1158
18 1400 1408 1415 M1.0 15 1162
18 2056 2104 2114 M1.3 15 1162
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center #
# Royal Observatory of Belgium #
# Fax : 32 (0) 2 373 0 224 #
# Tel.: 32 (0) 2 373 0 491 #
#--------------------------------------------------------------------#