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 Jul 23 1521 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1229 from 2024 Jul 15 Solar Active Regions (ARs) and flares --------------- The solar flaring activity of the last week was moderate with the exception of the high levels registered on 16 July. The only X-class flare of the week was an X1.9 at 16 Jul 13:26 UTC associated with NOAA Active Region 3738 (magnetic type Beta-Gamma-Delta, Catania sunspot group no 85). The brightest M-class flare of the week, an M3.6, was emitted from the same AR at 16 Jul 07:37 UTC. Most of the M-class activity was produced by NOAA AR 3744 (magnetic type Beta, Catania sunspot group no 96) with five M-class flares, the first being an M1.4 at 16 Jul 03:01 UTC and the last an M3.2 at 21 Jul 23:28 UTC. M-class flares were also emitted by NOAA AR 3751 (magnetic type Beta until 18 Jul, Beta-Gamma-Delta since, Catania sunspot group no 12), NOAA AR 3753 (magnetic type Beta, Catania sunspot group no 8), NOAA AR 3757 (magnetic type Beta, Catania sunspot group no 20), NOAA AR 3758 (magnetic type Beta, Catania sunspot group no 93). Coronal mass ejections --------------------- No Earth-directed, halo or partial halo, Coronal Mass Ejections (CME) were observed during the last week. Coronal Holes --------------------- A northern Coronal Hole (CH) with negative polarity crossed the central meridian between 15 and 18 Jul. Proton flux levels --------------------- The greater than 10 MeV proton flux was at nominal levels over the last week. Electron fluxes at GEO --------------------- The greater than 2 MeV electron flux, as measured by the GOES-16 satellite, was at nominal levels during the last week. The 24h electron fluence was at very low levels throughout last week. Solar wind --------------------- During the last week the Solar Wind (SW) conditions were typical of the slow SW regime, with the exception of a glancing blow from a Coronal Mass Ejection (CME) that lasted from 16 to 17 Jul. For the 15 Jul the SW speed was between 270 and 330 km/s, the total interplanetary magnetic field (Bt) ranged between 1 and 10 nT, the North-South magnetic component (Bz) fluctuated between -5 and 6 nT, while the interplanetary magnetic field phi angle was directed away and towards the Sun for an almost equal length of time. The disturbance caused an increase of SW speed to 420 km/s, a raise of Bt to 18 nT, a variation of the Bz between -10 and 13 nT, and the interplanetary magnetic field phi angle to be predominantly directed away from the Sun. The SW conditions returned to the slow SW regime on 18 Jul. The Bt ranged between 1 and 7 nT, the Bz -5 and 6 nT, and the interplanetary magnetic field phi angle was predominantly directed away from the Sun for the rest of the last week. Geomagnetism --------------------- During the last week the global geomagnetic conditions were quiet (NOAA Kp 1- to 2+) with the exception of the 16 Jul as they raised to unsettled levels (NOAA Kp 3+). This was the result of the arrival of a glancing blow associated with a Coronal Mass Ejection (CME). The local geomagnetic conditions started last week at unsettled levels (K BEL 3) and increased to active levels (K BEL 4) as a result of the glancing blow on 16 Jul. They returned to active levels (K BEL 3) for the rest of the week. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Jul 15 275 245 233 008 C2.7 3 0 2024 Jul 16 331 287 242 016 C2.9 4 1 2024 Jul 17 /// 283 224 007 C2.3 5 0 2024 Jul 18 303 289 209 005 C2.2 2 0 2024 Jul 19 333 278 202 006 C2.0 3 0 2024 Jul 20 /// 232 207 009 C1.9 2 0 2024 Jul 21 /// 218 198 006 C2.3 4 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 Catania/NOAA RADIO_BURST_TYPES 15 0329 0345 0355 ////// M1.2 F 85/3738 15 0921 0937 1008 S07W66 M2.7 SN 85/3738 III/1VI/1 15 1008 1013 1019 S08W64 M1.9 SF 85/3738 16 0249 0301 0322 N16E02 M1.4 1N 96/3744 16 0724 0737 0750 N11W27 M3.6 1B 08/3753 III/1 16 1311 1326 1336 S06W85 X1.9 1B 85/3738 III/1II/3IV/2 16 2106 2124 2136 N11W34 M1.6 1N 08/3753 16 2146 2206 2217 N18W10 M1.9 1N 96/3744 III/2II/2 17 0626 0639 0701 S10W31 M5.0 2B 93/3743 III/1II/1 17 0701 0708 0713 N09W39 M3.4 SF 93/3743 VI/2II/1IV/1 17 0926 0945 1010 S10W83 M1.2 SF ///3738 17 1940 1951 1953 N11W46 M1.2 1N 08/3753 17 1953 1958 2004 ////// M2.0 08/3753 18 1004 1014 1020 S07E24 M2.2 SN 12/3751 18 1020 1027 1031 ////// M2.0 12/3751 19 0813 0823 0830 N11W67 M3.2 1F 08/3753 III/1 19 1753 1806 1825 S10E03 M2.0 2N 12/3751 19 2244 2251 2306 ////// M1.0 93/3758 20 0710 0720 0724 S07W03 M1.8 SF 12/3751 20 1836 1849 1902 N12W68 M1.5 1N 96/3744 VI/1 21 0346 0355 0359 ////// M1.4 96/3744 VI/2 21 0828 0834 0841 ////// M1.5 12/3751 21 1618 1631 1659 ////// M1.0 20/3757 III/2II/2 21 2321 2328 2334 N15W86 M3.2 SF 96/3744 #--------------------------------------------------------------------# # 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.