:Issued: 2010 Dec 07 1914 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 518 from 2010 Nov 29 SOLAR ACTIVITY -------------- Flaring activity was limited. A filament near the central meridian in the northern hemisphere erupted late Nov 28. The CME came into the view of STEREO A COR2 at 23:54UT, Nov 28. The eruption was directed above the ecliptic. According to EUV-solar disk images and magnetograms, the flux rope had a WNE magnetic configuration. Such a configuration does not lead to strong reconnection with the earth magnetic field, in case of arrival. Another plasma eruption took place on Nov 30, 17:43UT in the east of the solar disk. Evidence for this eruption was a coronal dimming and an EUV-wave. The source region had no NOAA or Catania numbering. The CME was visible in STEREOA/COR2 and HI1 data. It was propagating slightly above the ecliptic and to the east. GEOMAGNETIC ACTIVITY -------------------- The geomagnetic conditions were very quiet this week with Kp between 0 and 2. We could determine in ACE data of Nov 03, around 21:30UT the arrival of a small shock as the density increased abruptly. The temperature and the speed of the plasma following this (small) jump, increased also. This feature in the solar wind data is possibly a glancing blow of one of the two filament eruptions. But as already mentioned, the magnetic field of the Earth was not disturbed. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2010 Nov 29 023 016 83 006 A9.2 0 0 2010 Nov 30 042 015 86 004 B1.1 0 0 2010 Dec 01 043 018 87 004 B1.1 0 0 2010 Dec 02 035 020 87 004 B1.1 0 0 2010 Dec 03 /// 023 87 001 B1.2 0 0 2010 Dec 04 052 030 87 002 B1.1 0 0 2010 Dec 05 /// 025 88 002 B1.1 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 # # # # 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 # #--------------------------------------------------------------------#