:Issued: 2010 Nov 09 1543 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 514 from 2010 Nov 01 SOLAR ACTIVITY -------------- Several sunspot groups were observed on the solar disc during the week: Catania numbers 56, 58, 59, and 60 (NOAA ARs 1117, 1120, 1121, and 1122 respectively). Catania sunspot group 56 (NOAA AR 1117) was observed at the west solar limb on November 1. The strongest flare it produced was a C1.1 flare peaking at 04:43 UT on that day. The sunspot group then disappeared behind the limb. Catania sunspot group 58 (NOAA AR 1120) was observed throughout the week. It did not produce any flaring activity above the B-level. Catania sunspot group 59 (NOAA AR 1121, NOAA AR 1112 during the previous rotation) produced the most of the flaring activity during the week: 10 C-flares and 3 M-flares. It emerged from behind the solar east limb on November 4, but it produced 3 C-class flares even before (on November 3), when still located behind the limb. The strongest flare that occurred in this active region was the M5.4 flare peaking at 15:36 UT on November 6. Due to the position of this sunspot group close to the east limb, CMEs associated with flaring activity from this group did not arrive at the Earth and were therefore not geoeffective. Catania sunspot group 60 (NOAA AR 1122) emerged on November 6. It did not produce any flaring activity until the end of the week. A filament eruption near the solar central meridian in the southern hemisphere (around S40E15) was observed by SDO/AIA between 01:00 UT and 02:00 UT on November 3. It was accompanied by coronal dimmings and a post-eruption arcade. The corresponding CME was detected by SECCHI COR1 and COR2 coronagraphs onboard STEREO (SOHO/LASCO had a data gap). The corresponding ICME arrived at the Earth on November 8. GEOMAGNETIC ACTIVITY -------------------- On November 1 the Earth was situated inside the ICME that arrived on the day before. Due to predominantly northward interplanetary magnetic field and low solar wind speed, no geomagnetic disturbance resulted. During the rest of the week, the Earth was situated inside a slow solar wind flow with weak to average interplanetary magnetic field magnitude. The geomagnetic conditions were quiet. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2010 Nov 01 /// 013 79 004 A8.0 0 0 2010 Nov 02 018 011 79 003 A9.9 0 0 2010 Nov 03 021 011 79 006 B2.1 0 0 2010 Nov 04 026 014 79 003 B1.8 1 0 2010 Nov 05 026 016 83 002 B1.8 1 0 2010 Nov 06 051 023 89 002 B1.8 1 0 2010 Nov 07 /// 024 85 003 B1.2 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 04 2330 2358 0012 S20E76 M1.6 SF 59 1121 05 1243 1329 1406 S20E75 M1.0 59 1121 06 1527 1536 1544 S19E58 M5.4 1N 100 59 1121 #--------------------------------------------------------------------# # 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. Please do not reply # # directly to this message, but send comments and suggestions to # # 'sidctech@oma.be'. If you are unable to use that address, use # # 'rvdlinden@spd.aas.org' instead. # # To unsubscribe, visit http://sidc.be/registration/unsub.php # #--------------------------------------------------------------------#