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 |
Archive
Latest issue
:Issued: 2024 Jul 16 1647 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1228 from 2024 Jul 08 Solar Active Regions (ARs) and flares --------------- The solar flaring activity over the past week was at low to high levels with almost daily M-class flaring and an X1.2 flare with start time 02:23 UTC, peak time 03:18 UTC, end time 02:34 UTC on July 14. There were over thirteen numbered and several unnumbered active regions on the visible solar disc. The largest and most complex region throughout the entire week was NOAA AR 3738, which started as magnetic type beta-gamma and towards the end of the week reached magnetic type beta-gamma-delta. This regions was the main driver for most of the flaring activity throughout the week. NOAA AR 3743 (beta-gamma), NOAA AR 3745 (beta) and NOAA AR 3751 (beta) also contributed to the moderate levels of activity with isolated low M-class flaring. Coronal mass ejections --------------------- There were multiple filament and prominence eruptions, including a fast partial halo coronal mass ejection (CME) detected in the LASCO/C2 coronagraph imagery starting at 21:24 UTC on July 10. None of these events were expected to have an Earth-directed component and there were no other CME arrival forecasted, nor detected throughout the week. Coronal Holes --------------------- Multiple negative polarity coronal holes and one long and a patchy positive polarity coronal hole (stretching from high northern to the equatorial latitudes) have crossed the central meridian throughout the week. Proton flux levels --------------------- The greater than 10 MeV proton flux was at nominal levels throughout the entire 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 throughout the entire week. The electron fluence was at nominal levels throughout the entire week. Solar wind --------------------- The solar wind conditions throughout the entire week were mostly indicative of nominal slow solar wind conditions with velocities below 445 km/s. Sight enhancements in the solar wind data possibly indicative of a connection to negative polarity coronal holes were registered on July 08 and July 09 with the interplanetary magnetic field reaching almost 11 nT and a minimum Bz component reaching -8.5 nT. A connection to a positive polarity coronal was expected on July 13 and July 14 when the interplanetary magnetic field registered a rotation and the phi angle started switching from the negative to the positive sector. Despite that there were no clear signatures of a high speed stream arrival and the solar wind remained at slow solar wind regime. Geomagnetism --------------------- The geomagnetic conditions were at globally quiet to unsettled levels on July 08 and remained quiet throughout the rest of the week. The local geomagnetic conditions over Belgium started at quiet to active levels on July 08 and continued at quiet to unsettled through the week. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Jul 08 140 111 169 012 C2.2 1 0 2024 Jul 09 173 138 180 008 C1.9 0 0 2024 Jul 10 /// 181 214 006 C2.7 5 0 2024 Jul 11 /// 170 205 006 C1.9 2 0 2024 Jul 12 235 170 210 007 C1.8 0 0 2024 Jul 13 /// 188 238 006 C2.1 6 0 2024 Jul 14 /// 219 234 008 C3.3 4 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 08 1234 1241 1246 S23E78 M1.1 SF /////// 10 0544 0559 0609 S10E21 M1.5 SN 85/3738 10 0926 0945 0953 S10E10 M1.3 SF 85/3738 10 1144 1204 1217 S10E01 M1.4 1F 85/3738 10 1251 1304 1313 S10E01 M1.1 1F 85/3738 10 1525 1537 1546 S08E03 M1.0 SF 85/3738 11 0403 0417 0437 S08E09 M1.2 SF 94/3745 11 0617 0625 0632 ////// M1.2 85/3738 13 0255 0318 0336 ////// M1.4 85/3738 13 1221 1242 1258 ////// M5.3 85/3738 /1 29I/1 13 1459 1530 1541 ////// M1.8 05/3747 13 1541 1544 1548 ////// M1.9 05/3747 13 1925 1930 1934 ////// M1.0 F 85/3738 13 2244 2301 2312 ////// M5.0 85/3738 14 0105 0116 0131 ////// M1.7 85/3738 14 0223 0234 0248 ////// X1.2 85/3738 II/2 14 0405 0413 0418 ////// M3.0 F 85/3738 I/2II/1 14 1016 1020 1024 ////// M1.0 F 85/3738 14 2050 2057 2103 ////// M1.0 85/3738 #--------------------------------------------------------------------# # 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 # #--------------------------------------------------------------------#
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.