:Issued: 2010 Feb 23 0939 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 477 from 2010 Feb 15 SOLAR ACTIVITY -------------- The flaring activity was low during the past week. There was one C1.9 flare, originating from NOAA 1048. This active region launched several B-flares during the rest of the week. During the week, several (small) CMEs were observed by STEREO and LASCO. Non of these were earth-directed. The solar wind speed was very low during the whole week, except on 19 February when it went up to 500 km/s. GEOMAGNETIC ACTIVITY -------------------- On February 15, there was a jump in the magnetic field strength visible in the ACE data. This shock originated from the CME associated to the event that started at 12h36UT on February 13. As a consequence, the planetary K-index reached unsettled conditions (Kp=4) for two periods in the evening of February 15. During the rest of the week there were fluctuations in the magnetic field, but in combination the low solar wind speed, none of them were geo-effective. So geomagnetic activity was low during the rest of the week. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2010 Feb 15 039 019 88 013 A9.6 0 0 2010 Feb 16 /// 019 87 011 A7.0 0 0 2010 Feb 17 058 027 87 009 A6.5 0 0 2010 Feb 18 034 016 85 008 A5.7 0 0 2010 Feb 19 /// 013 84 004 A5.1 0 0 2010 Feb 20 020 013 84 001 A5.1 0 0 2010 Feb 21 /// 011 84 002 A4.4 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 # #--------------------------------------------------------------------#