:Issued: 2025 Nov 10 1635 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1297 from 2025 Nov 03 Solar Active Regions (ARs) and flares --------------- The Solar flaring activity was at moderate to high levels throughout the week, with 62 C-class flares, 9 M-class flares and 3 X-class observed. There were 10 sunspot groups observed on the visible solar disk. SIDC SG 687 (NOAA AR 4274), SIDC SG 690 (NOAA AR 4277) and SIDC SG 689 (NOAA AR 4276) produced most of the flaring activity. The largest flare was a X1.8 flare, peaking on November 04 at 17:34 UTC. The second largest flare was a X1.7 flare peaking on November 09 at 07:35 UTC Both of these flares were produced by SIDC Sunspot Group 687. The third largest was a X1.1 flare peaking on November 04 at 22:01 UTC, which was probably produced by SIDC SG 689 while it was still over the east limb. Coronal mass ejections --------------------- Seven Coronal mass ejections (CMEs) with an Earth directed component were observed throughout the week. All these CMEs were associated with SIDC SG 687. The first CME was seen in LASCO-C2 data at 09:24 UTC on November 03, with an estimated speed of 1118 km/s. A second halo CME was seen in LASCO-C2 data at 17:24 UTC on November 04 associated with a X1.8 flare, with an estimated speed of 1297 km/s. A third halo CME was seen in LASCO-C2 data at 11:00 UTC on November 05 associated with a M7.4 flare, with an estimated speed of 844 km/s. A fourth halo CME was seen in LASCO-C2 data at 22:12 UTC on November 05 associated with a M8.6 flare, with an estimated speed of 800 km/s. A fifth halo CME was seen in LASCO-C2 data at 07:36 UTC on November 07 associated with a M1.76 flare, with an estimated speed of 528 km/s. A sixth CME was seen in LASCO-C2 data at 12:12 UTC on November 07 associated with a C3.1 flare, with an estimated speed of 350 km/s. A seventh halo CME was seen in LASCO-C2 data at 07:12 UTC on November 09 associated with a X1.79 flare, with an estimated speed of 720 km/s. Coronal Holes --------------------- One positive polarity (SIDC CH 123) and two negative polarity (SIDC CH 116 & 126) coronal holes were present on the solar disk in the past week. Returning, equatorial SIDC Coronal Hole 116 first reached the central meridian on November 03 (Other crossing times: October 08, September 10, August 15, July 20, June 22, May 26) and completed its crossing on November 06. The high-speed stream (HSS) associated with SIDC Coronal Hole 116 reached the Earth on November 05. Proton flux levels --------------------- The greater than 10 MeV GOES proton flux became elevated on November 05 until November 06 due to a CME that left the Sun on November 04 but remained below the 10 pfu threshold. The 10 MeV GOES proton flux remained at nominal levels for the rest of the week. Electron fluxes at GEO --------------------- The greater than 2 MeV electron flux, as measured by GOES-18 and GOES-19 was above the 1000 pfu threshold at the start of the week until November 05. The 24-hour electron fluence was at moderate levels at the start of the week until November 05 and then stayed at normal level until the end of the week. Solar wind --------------------- At the beginning of the week, solar wind conditions at Earth were mildly disturbed under the waning influence of high-speed streams (HSSs) associated with SIDC Coronal Hole 123 and 129. They became disturbed again by the arrival of a high-speed stream on November 05 at 17:15 UT associated with SIDC Coronal Hole 116, a ICME arrival at 18:40 UT on November 06 associated with a CME that left the Sun on November 03, an ICME arrival at 05:00 UT on November 07 associated with a CME that left the Sun on November 04 and a ICME arrival at 22:00 on November 07 associated with a CME that left the Sun on November 05. The solar wind speed ranged between 336 km/s and 859 km/s. The total interplanetary magnetic field ranged between 1 nT and 24 nT, with the Bz reaching a minimum of – 17 nT. The phi-angle was in the positive sector at the start of the week until November 06 when it switched to the positive sector for the rest of the week. Geomagnetism --------------------- The geomagnetic conditions were at active levels at the start of the week. They became quiet to unsettle on November 04. On November 05 they reached major storm conditions globally (Kp 7-) and moderate storm conditions locally (K BEL 6), under the influence of a high-speed stream and 3 ICMEs by November 08 they had returned to quiet to unsettled conditions. The period ended with quiet geomagnetic conditions. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2025 Nov 03 088 072 133 020 C1.1 5 0 2025 Nov 04 092 086 159 010 C1.2 2 2 2025 Nov 05 085 079 147 027 C1.4 2 0 2025 Nov 06 122 114 163 038 C1.2 1 0 2025 Nov 07 /// 134 166 026 C1.3 1 0 2025 Nov 08 /// 151 172 028 C1.2 0 0 2025 Nov 09 /// 164 176 006 C1.1 0 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 03 0841 0925 0938 ////// M1.6 ///4274 VI/3 03 0938 1011 1037 ////// M5.0 ///4274 03 1219 1235 1237 ////// M2.9 ///4274 VI/2IV/1 03 1704 1708 1710 N26E69 M1.5 SF ///4274 04 0131 0148 0204 ////// M3.5 89/4274 III/2CTM/2 03 1237 1247 1251 ////// M3.3 ///4274 04 1715 1734 1751 N26E63 X1.8 1B 89/4274 VI/2III/2IV/1 04 2145 2201 2211 ////// X1.1 ///4276 IV/1 04 2233 2244 2256 N22E36 M1.7 1 88/4272 III/2 05 1036 1119 1143 N22E51 M7.4 2N 89/4274 05 2152 2207 2216 N28E40 M8.6 2B 89/4274 II/3 06 0417 0431 0439 ////// M1.1 ///4276 07 0631 0716 0753 N23E28 M1.7 1N 89/4274 VI/2IV/3 09 0701 0735 0755 N23W03 X1.7 2 89/4274 II/2IV/2IV/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 # #--------------------------------------------------------------------#