From sidctech@oma.be Mon Jul 10 12:09:42 2006 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on auriga.ta3.sk X-Spam-Level: X-Spam-Status: No, score=-2.0 required=5.0 tests=AWL,BAYES_00, FORGED_RCVD_HELO,TO_CC_NONE autolearn=no version=3.1.3 Received: from bonnie.oma.be (bonnie.oma.be [193.190.231.71]) by auriga.ta3.sk (8.13.6/8.13.1) with ESMTP id k6AC9dvk002905 for ; Mon, 10 Jul 2006 12:09:39 GMT Received: from titus.oma.be (bonnie.oma.be [193.190.231.71]) by bonnie.oma.be (8.11.1 (Revision 1.9) /8.11.1) with ESMTP id k6AC9be15299 for ; Mon, 10 Jul 2006 12:09:37 GMT Received: from titus.oma.be (localhost [127.0.0.1]) by titus.oma.be (8.13.4/8.13.4) with ESMTP id k6AC9PXU016058 for ; Mon, 10 Jul 2006 12:09:25 GMT Received: (from sidc@localhost) by titus.oma.be (8.13.6/8.13.6/Submit) id k6AC9PES016054 for choc@astro.sk; Mon, 10 Jul 2006 12:09:25 GMT Date: Mon, 10 Jul 2006 12:09:25 GMT Message-Id: <200607101209.k6AC9PES016054@titus.oma.be> X-Authentication-Warning: titus.oma.be: sidc set sender to sidctech@oma.be using -f From: Solar Influences Data analysis Center Reply-To: sidctech@oma.be Precedence: special-delivery Subject: SIDC Weekly Bulletin X-Virus-Scanned: ClamAV version 0.88.3, clamav-milter version 0.88.3 on localhost X-Virus-Scanned: by amavisd-milter (http://www.amavis.org/) X-Virus-Status: Clean X-Status: X-Keywords: X-UID: 594 Status: RO :Issued: 2006 Jul 10 1206 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 288 from 2006 Jul 03 SOLAR ACTIVITY -------------- Solar activity was dominated by NOAA active region 0898 (Cat 60), magnetic classification beta to beta-gamma-delta (from July 7 onwards). In white light it appeared as one big sunspot. On July 3rd it was situated near the central meridian. It showed B and low C flaring activity. On Thurday Jul 6 an M2.5 LDE erupted from the active region around 8 UT (see SIDC event database for details). There was an associated CME and a dimming and post-eruptive-arcades were observed in EIT. The CME was directed SW and had a maximum speed of 975 km/s and a median speed of 600 km/s. It arrived at L1 late on July 9th. Two recurring equatorial coronal holes were visible during this week. CH1 was situated at the central meridian on July 2nd and CH2 on July 8th. GEOMAGNETIC ACTIVITY -------------------- The week started very quiet with a solar wind speed around 300 km/s. On July 4th the high speed wind stream from CH1 (see above) reached the ACE spacecraft. On July 5th a solar windspeed of 600 km/s was reached (this is 100 km/s less compared to previous rotation) and the magnetic field was intense (+/- 20 nT) for several hours. This induced a ~24hr period of geomagnetic active to minor storm conditions on July 4-5. The high speed wind stream from CH2 is expected to arrive on July 12th; active to minor storm conditions are foreseen. At the end of the week, the CME which erupted on July 6th arrived at L1 late on July 9th. A shock was recorded in ACE data around 20:40 UT. The solar wind speed jumped from 350 to ~420 km/s and the magnetic field was intensified to ~10 nT with southward excursions. It triggered active geomagnetic conditions at several latitudes. Active to geomagnetic conditions are expected on July 11-12 due to a recurring equatorial coronal hole. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2006 Jul 03 037 021 86 004 A5.9 0 0 2006 Jul 04 029 020 88 016 A8.6 0 0 2006 Jul 05 043 022 85 020 B1.2 0 0 2006 Jul 06 033 023 85 010 B1.0 1 0 2006 Jul 07 /// 022 80 008 A5.9 0 0 2006 Jul 08 046 022 77 004 A4.9 0 0 2006 Jul 09 /// /// 75 005 A3.5 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 06 0813 0836 0851 S11W32 M2.5 2F 350 III/2,II/2,IV/1 60 0898 CME (> 600 km/s), Post-eruptive arcades, Dimming; arrived at L1 on Jul 9th 20:40 UT (10 nT, K=4) #--------------------------------------------------------------------# # 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. # #--------------------------------------------------------------------#