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 May 15 0737 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1218 from 2024 Apr 29 Solar Active Regions (ARs) and flares --------------- Solar flaring activity over the past week started at moderate levels, until May 03 when they went to high levels until the end of the week. A total of 17 active regions were visible on the solar disk throughout the week. A total of 47 C-class flares, 26 M-class flares and 3 X-class flares were recorded, the strongest being an X1.69-flare with peak time 02:22 UTC on May 03 associated with NOAA AR 3663. Throughout the week, most of the flaring activity came from NOAA AR 3654, 3663 and 3364, with all of the X-class flares coming from NOAA AR 3663. Coronal mass ejections --------------------- Four notable coronal mass ejections (CMEs) were observed over the course of the week. The first was a north-west directed CME, detected in LASCO C2 data on April 29 at 12:36 UT and associated with NOAA AR 3654. This CME probably impacted the Earth on May 02. The second was a westward directed CME, detected in LASCO C2 data on May 01 at 06:36 UT and associated with NOAA AR 3654. This CME probably impacted the Earth on May 05. The third was a north-east directed partial halo CME, detected in LASCO C2 data on May 03 at 03:01 UT and associated with NOAA AR 3663 and a X1.69-flare. This CME probably arrived on May 05 or 06. The fourth was a north-east directed CME detected in LASCO C2 data on May 04 at 21:17 UT. Coronal Holes --------------------- At start of the week the Earth was under the influence of a high-speed stream from a small positive coronal hole and a large negative coronal hole stretching from the north pole to the equator was passing the central meridian. The negative coronal hole then broke up into two smaller coronal holes. The Earth may have come under the influence of a high-speed stream of one of these coronal holes on May 03. Three more small positive coronal holes rotate on disk throughout the week. A high-speed stream from one of these positive coronal holes may have influenced the earth on May 05. Proton flux levels --------------------- The 10 MeV proton flux was at nominal levels throughout the week. Electron fluxes at GEO --------------------- The greater than 2 MeV electron flux measured by GOES-16 was at background levels throughout the week. The 24h electron fluence was at nominal levels throughout the week. Solar wind --------------------- At the start of the week the solar wind conditions were enhanced under the influence of a high-speed stream. After retuning to slow solar wind conditions, they became enhanced again on April 30 due to the arrival of an ICME and then the solar wind conditions became enhanced again due to the arrival of a ICME on May 02 and the influence of a HSS, with the Bz reaching a minimum of -19.05 nT. At the end of the week on May 05 the solar wind condition was disturbed due to the possible arrival of 2 ICMEs and a high-speed stream. Over the week the solar wind speed varied between 304 and 536 km/s. he interplanetary magnetic field varied between 0.35 nT and 21.72 nT, with the Bz reaching a minimum value of -19.05 nT. The phi-angle was mainly in the positive sector (directed away from the Sun) with periods in the negative sector. Geomagnetism --------------------- The geomagnetic conditions over the past week were quiet to unsettled throughout most of the week. Active conditions globally (Kp 4) and minor storm conditions locally (K_BEL 5) were reached on April 30 in response to the perturbed solar wind perturbed associated with the passage of ICME. Mayor storm conditions globally (Kp 7 -) and moderate storm conditions locally (K Bel 6) were reached on May 02 in response to the perturbed solar wind perturbed associated with the passage of ICME. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Apr 29 138 100 138 009 C1.2 2 0 2024 Apr 30 /// 087 130 017 B9.4 4 0 2024 May 01 /// 105 135 010 B9.0 3 0 2024 May 02 127 133 142 035 C1.1 2 0 2024 May 03 155 151 156 008 C1.6 5 1 2024 May 04 /// 168 167 007 C2.3 6 0 2024 May 05 /// 170 177 010 C2.7 9 2 --------------------------------------------------------------------------- # 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 29 0033 0048 0054 S08W40 M2.5 1N 74/3654 29 0054 0111 0120 ////// M3.7 74/3654 30 0046 0114 0131 S06W50 M1.6 SF 74/3654 VI/1 30 1450 1511 1526 S07W60 M1.2 SF 74/3654 30 1611 1633 1647 S05W60 M1.3 SF 74/3654 III/1 30 2323 2346 2358 S05W63 M9.5 2B 74/3654 III/2 01 1417 1432 1437 S05W75 M1.8 SN 74/3654 III/1 01 1437 1444 1448 S08W75 M1.9 SN 74/3654 III/1 01 2226 2231 2237 N25E24 M1.8 SN ///3663 V/3III/2 02 0207 0217 0224 N25E23 M1.0 1N 84/3663 VI/1 02 2052 2057 2101 ////// M2.7 86/3664 III/2 03 0008 0015 0019 S21E59 M2.7 1N 86/3664 III/3 03 0211 0222 0227 N25E07 X1.6 1B 84/3663 III/2VI/2II/2IV/1 03 0805 0811 0816 N24E05 M4.4 SB 84/3663 III/1 03 2225 2247 2311 N26W06 M1.2 SF 74/3654 III/3 03 2311 2316 2320 N26W06 M1.0 SF 84/3663 III/3 03 2324 2330 2336 N26W06 M2.4 SN 84/3663 III/2 04 0026 0036 0044 N26W06 M1.6 SF 84/3663 04 0602 0619 0630 N26W08 M9.1 1B 84/3663 III/3II/1IV/1 04 0704 0707 0711 ////// M1.5 84/3663 04 1810 1820 1825 ////// M1.3 84/3663 04 2223 2237 2254 ////// M3.2 84/3663 04 2328 2348 2355 N26W10 M9.0 1B 84/3663 III/1 05 0115 0127 0143 N26W10 M8.4 1B 84/3663 VI/1 05 0547 0601 0607 N26W10 X1.3 1B 84/3663 III/3 05 0807 0819 0824 N27W21 M1.3 SF 84/3663 05 0923 0938 0953 S20E22 M2.3 SN 86/3664 III/1 05 0953 1000 1019 N26W21 M7.4 1B 84/3663 VI/1 05 1141 1154 1216 N26W22 X1.2 1B 84/3663 05 1433 1447 1456 N25W25 M1.3 SF 84/3663 VI/1 05 1528 1538 1551 N24W26 M2.2 2N 84/3663 05 1655 1701 1706 S19E25 M1.3 1F 86/3664 III/2 05 1834 1840 1845 S19E25 M1.0 SF 86/3664 III/1 05 1944 1952 2006 N24W28 M1.3 2N 84/3663 III/1 #--------------------------------------------------------------------# # 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.