:Issued: 2010 Jan 26 1327 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 473 from 2010 Jan 18 SOLAR ACTIVITY ------------- The week started with NOAA AR 11040 disappearing over the west limb, on January 18. On January 19, NOAA AR 11041 (ex NOAA AR 11039, Catania number 37, Beta magnetic configuration) rotated onto the visible solar disk and created the largest peak in solar activity in 2 years. It produced 6 M-class flares in 48 hours, the largest one was an M3.4 flare with peak at 17:55 UT on January 20, location S24E88. From January 21 onwards, solar activity decayed and no more M-class flares were seen. On January 22, a sunspot group with Catania number 38 (Beta magnetic configuration, it was given NOAA number 11042 on January 23) emerged at N21W19, but it did not produce any significant activity. GEOMAGNETIC ACTIVITY ------------------- There was a minor geomagnetic storm during one 3-hour period (Kp=5) starting at 15:00 UT on January 20, caused by the late arrival of the fast solar wind from a coronal hole. No more disturbances were recorded. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2010 Jan 18 /// 010 82 003 B1.9 0 0 2010 Jan 19 000 000 84 001 B3.3 2 0 2010 Jan 20 014 008 82 015 B5.0 4 0 2010 Jan 21 017 011 83 003 B1.5 0 0 2010 Jan 22 030 021 82 003 A8.4 0 0 2010 Jan 23 037 025 85 006 A8.0 0 0 2010 Jan 24 /// 025 85 005 A9.8 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 19 1303 1341 1350 S25E88 M2.3 37 1041 19 2023 2035 2046 S28E88 M1.7 III/1 37 1041 20 0645 0727 0734 S24E87 M1.0 SF 37 1041 20 0742 0749 0753 S24E88 M1.6 SF 37 1041 20 1046 1059 1110 S25E87 M1.8 37 1041 20 1750 1755 1800 S26E81 M3.4 SF 1041 #--------------------------------------------------------------------# # 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 # #--------------------------------------------------------------------#