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: 2024 Dec 10 1724 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1249 from 2024 Dec 02 Solar Active Regions (ARs) and flares --------------- Solar flaring activity was at low levels at the start of the week. It increased to moderate levels on December 4, remained moderate for most of the week, and reached high levels on December 8. There were 14 active regions visible throughout the week. A total of 81 C-class flares, 10 M-class flares and 1 X-class flare were recorded. Throughout the week, most of the flaring activity was produced by SIDC Sunspot Group 323 (NOAA Active Region 3906), SIDC Sunspot Group 305 (NOAA Active Region 3912), SIDC Sunspot Group 330 (NOAA Active Region 3916), and SIDC Sunspot Group 288 (NOAA Active Region 3917). The largest flare was an X2.2 flare (SIDC Flare 2856), peaking at 09:06 UTC on December 8, associated with SIDC Sunspot Group 305. Type II radio emissions were detected at 09:05 UTC on December 8 during the flaring activity. Coronal mass ejections --------------------- No Earth-directed Coronal Mass Ejections (CMEs) were detected in the available coronagraph imagery over the past week. Coronal Holes --------------------- Two positive polarity coronal holes, one in the southern hemisphere and one in the northern hemisphere, began to transit the central meridian on December 4 and December 6, respectively. Proton flux levels --------------------- The greater than 10 MeV proton flux, as recorded by GOES-18, was below the 10 pfu threshold during the last week. Electron fluxes at GEO --------------------- The greater than 2 MeV electron flux, as measured by GOES 16 and GOES 18, was below the 1000 pfu threshold during the last week. The electron fluence was at normal levels throughout the entire week. Solar wind --------------------- The solar wind parameters reflected slow solar wind conditions at the beginning of the week. The solar wind parameters became slightly disturbed on December 2, likely due to the arrival of an ICME related to the partial halo CME first detected in LASCO/C2 data around 19:24 UTC on November 27. The interplanetary magnetic field reached values up to 14 nT, and the solar wind speed increased from around 350 km/s to 500 km/s. After returning to slow solar wind conditions, the solar wind parameters became slightly disturbed again around 21:15 UTC on December 7, with the interplanetary magnetic field reaching up to 11 nT. This disturbance was likely due to the mild influence of a high-speed stream (HSS) from a positive polarity coronal hole that began crossing the central meridian on December 4. Geomagnetism --------------------- Geomagnetic conditions over the past week were mostly quiet to unsettled. Active conditions were recorded globally between 00:00 and 03:00 UTC on December 3 (NOAA Kp: 4-) and locally over Belgium between 18:00 and 22:00 UTC on the same day (K-BEL: 4). --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Dec 02 /// 128 185 005 C1.5 0 0 2024 Dec 03 162 124 185 012 C1.3 0 0 2024 Dec 04 185 123 175 008 C1.8 3 0 2024 Dec 05 /// 128 175 004 C1.6 3 0 2024 Dec 06 185 116 178 006 C1.7 1 0 2024 Dec 07 /// 138 183 005 C1.6 2 0 2024 Dec 08 /// 143 178 006 C1.5 1 1 --------------------------------------------------------------------------- # 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 Catania/NOAA RADIO_BURST_TYPES 04 0952 1000 1008 ////// M2.3 /////// II/2 04 2031 2046 2057 S15E58 M1.3 SN 30/3916 04 2057 2105 2112 ////// M1.4 ///3917 05 0656 0709 0733 S07E66 M1.0 SF 33/3917 05 0812 0820 0824 ////// M1.1 15/3906 VI/1III/1 05 1032 1040 1046 ////// M2.5 15/3906 III/3II/2 06 0906 0920 0942 S08E47 M1.2 SF 33/3917 VI/1 07 1300 1308 1315 S08E33 M2.3 SF 33/3917 07 2153 2215 2226 S08E28 M3.2 SN 33/3917 08 0850 0906 0910 S08W54 X2.2 2B 25/3912 II/3 08 1600 1611 1618 S09W58 M1.5 1N 25/3912 III/2 #--------------------------------------------------------------------# # Solar Influences Data analysis Center - RWC Belgium # # Royal Observatory of Belgium # # # # Website http://www.sidc.be. # # E-mail sidc-support@oma.be # # To unsubscribe http://www.sidc.be/registration/unsub.php # # # # Legal notices: # # - Intellectual Property Rights: # # http://www.astro.oma.be/common/internet/en/data-policy-en.pdf # # - Liability Disclaimer: # # http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf # # - Use and processing of your personal information: # # http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf # #--------------------------------------------------------------------#
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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.