:Issued: 2009 Oct 20 1817 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 459 from 2009 Oct 12 SOLAR ACTIVITY ------------- Solar activity was quiet during the period. An SIDC ALL QUIET ALERT was active from Monday Oct 12 till Saterday Oct 17. An unnumbered active region in the Southern hemisphere, which approached central meridian towards the end of the period, produced two EIT waves/dimmings (Oct 16 16:00 and again around Oct 17 19:00). No significant flaring was associated with these events. LASCO images showed faint hints of (partial?) halo CMEs. GEOMAGNETIC ACTIVITY ------------------- The above mentioned eruptions did not result in any effect on the solar wind, nor on the geomagnetic activity. A weak shock was seen in the solar wind on Oct 15, with a speed peaking up to 425 km/s. The rest of the period we saw a very gradual decrease down to 300 km/s. The estimated Kp index from NOAA did not go above Kp=2 during the period. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2009 Oct 12 000 000 70 002 A0.0 0 0 2009 Oct 13 000 000 70 004 A0.0 0 0 2009 Oct 14 /// 000 71 001 A0.0 0 0 2009 Oct 15 /// 000 70 006 A0.0 0 0 2009 Oct 16 /// 000 70 003 A0.0 0 0 2009 Oct 17 011 000 71 001 A0.0 0 0 2009 Oct 18 /// 000 70 000 A0.0 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 # #--------------------------------------------------------------------#