:Issued: 2010 Jul 21 1038 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 498 from 2010 Jul 12 SOLAR ACTIVITY ------------- Two active regions were present during the period: NOAA AR 11086 in the Southern hemisphere and NOAA AR 11087 in the Northern hemisphere. The latter was the biggest of the two, it developed a beta-gamma magnetic configuration on July 13, and produced C-class flares on various days during the period. GEOMAGNETIC ACTIVITY ------------------- The solar wind speed, as measured by the ACE spacecraft at L1, was at <350 km/s levels, except for an episode on July 15 and 16 with a wind speed going up to 450 km/s. This disturbance was a a consequence of a coronal hole on the solar disk and was preceded with a shock in the solar wind on late July 14 with the Bz component of the interplanetary magnetic field turning southward. As a consequence NOAA's estimated planetary Kp index peaked briefly to Kp=5 late July 14. The Kp index was at quiet levels (Kp < 3) otherwise during the period. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2010 Jul 12 040 024 80 006 B1.0 0 0 2010 Jul 13 044 017 79 003 A9.8 0 0 2010 Jul 14 018 010 78 013 A9.5 0 0 2010 Jul 15 027 011 76 011 A7.6 0 0 2010 Jul 16 015 009 77 005 A8.0 0 0 2010 Jul 17 /// 008 79 002 A9.4 0 0 2010 Jul 18 /// 008 77 002 A9.6 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 # #--------------------------------------------------------------------#