SIDC Weekly Bulletin
Review of past solar and geomagnetic activity.| Source | SIDC (RWC-Belgium) |
| Frequency | Weekly |
| Format | Plain text |
| Mail header | SIDC Weekly Bulletin |
| SIDC code | bul |
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:Issued: 2013 May 14 1217 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 644 from 2013 Apr 29 SOLAR ACTIVITY --------------- The week started with an M1.4 flare released by NOAA AR 11739 on May 5. On May 10, an M3.9 flare was produced by NOAA AR 11744 and an M1.3 flare by NOAA AR 11745. Throughout the week, 57 C flares and 3 M flares were registered by GOES. A large filament eruption took place near 40W 35N around 21:45 UT on May 11. An associated CME was registered by LASCO C2, STEREO COR2 A and B. A glancing blow from this CME is possible, with an expected arrival time at Earth in the first half of May 15. GEOMAGNETIC ACTIVITY --------------------- The IMF rose from 4 nT to 14 nT on May 6, whereas solar wind speeds rose from 400 km/s to 560 km/s in the same period. These effects were probably caused by a co-rotating interaction region followed by a positive-polarity coronal hole high speed stream. The IMF had decreased back to values of 4 nT by May 8, and stayed at that level for the rest of the week. Solar wind speeds decreased till May 12 to 360 km/s. Since there were no large southward Bz excursions, geomagnetic activity has been quiet (K Dourbes smaller than 4) throughout the week. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2013 Apr 29 149 036 142 004 B6.7 0 0 2013 Apr 30 /// 032 154 010 B6.7 0 0 2013 May 01 /// 028 159 028 B7.8 0 0 2013 May 02 123 021 149 012 B6.0 1 0 2013 May 03 093 029 148 006 B6.5 3 0 2013 May 04 /// 020 142 007 B6.4 0 0 2013 May 05 /// 030 137 012 B5.9 1 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 SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM RADIO BURST TYPES Catania NOAA 02 0458 0510 0519 N10W26 M1.1 1N III/2II/2 1731 03 1639 1655 1722 N10W38 M1.3 2N 1731 03 1724 1732 1741 N16E81 M5.7 SF 1739 03 1639 1655 1722 N10W38 M1.3 2N 1731 05 1742 1756 1758 N13E49 M1.4 SF 1739 #--------------------------------------------------------------------# # 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 # #--------------------------------------------------------------------#
Details
This report is sent once a week, typically on a monday.The weekly bulletin gives an overview of solar and geomagnetic activity of the past week and includes a noticeable solar events list.
Check the ISES code book for information on ISES codes.