:Issued: 2024 Dec 02 1618 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1248 from 2024 Nov 25 Solar Active Regions (ARs) and flares --------------- The past week started with high solar flaring activity as seven M-class X-ray flares were detected on 25 Nov. The brightest of those flares was an M9.4 registered at 07:42 UTC and was located at E90N15. The solar region responsible for this flare and an M1.5 at 17:07 UTC was later identified as SIDC Sunspot Group 302 (NOAA Active Region [AR] 3910). The rest of the M-class flaring activity was associated with the SIDC Sunspot Groups 298 (NOAA AR 2901), 322 (NOAA AR 3905), and 323 (NOAA AR 3906). Moderate flaring activity was observed again on 27 Nov, as an M1.0 flare was registered from the location of SIDC sunspot group 298. For the rest of the week only C-class flares were observed. Coronal mass ejections --------------------- A Coronal Mass Ejection (CME) was registered in LASCO-C2/SOHO images on 25 Nov. It arrived at the Earth's atmosphere on 29 Nov. Coronal Holes --------------------- A very small equatorial corona hole with positive polarity crossed the solar central meridian on 28 Nov. Proton flux levels --------------------- The greater than 10 MeV proton flux, as measured by the GOES-18 satellite, was at nominal levels throughout the week. Electron fluxes at GEO --------------------- The greater than 2 MeV electron flux as measured by GOES-18 was below the 1000 pfu threshold and the 24h electron fluence was at nominal levels throughout the week. Solar wind --------------------- The Solar Wind (SW) conditions were in general typical of the slow SW regime during the past week. The SW speed was below 500 km/s, the total interplanetary magnetic field (Bt) registered values up to 17 nT, and the North-South magnetic component (Bz) ranged between -10 and 14 nT. The interplanetary magnetic field phi angle was mostly directed away from the Sun. The highest (and the lowest Bz) of those physical quantities were measured during the arrival of a Coronal Mass Ejection (CME) on 29 Nov at 17:00 UTC that lasted until 30 Nov 05:30 UTC. Geomagnetism --------------------- The global and local geomagnetic conditions were generally quiet during the past week. The only noticeable exception was the minor storm (NOAA Kp 5-) registered globally on 30 Nov from 00:00 to 03:00 UTC. The local conditions of the same day only registered active levels (K BEL 4). --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Nov 25 /// 167 220 009 C2.9 7 0 2024 Nov 26 219 160 222 005 C2.0 0 0 2024 Nov 27 222 205 225 005 C1.8 1 0 2024 Nov 28 213 170 214 003 C1.8 0 0 2024 Nov 29 /// 161 220 008 C1.5 0 0 2024 Nov 30 /// 121 204 012 C1.6 0 0 2024 Dec 01 /// 121 186 008 C1.4 0 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 25 0139 0159 0211 ////// M1.1 15/3906 25 0439 0453 0459 ////// M1.8 15/3906 25 0724 0742 0803 ////// M9.4 /////// III/1 25 1201 1212 1217 S12E40 M2.0 SF 14/3905 VI/1 25 1607 1636 1658 ////// M1.0 15/3906 25 1658 1707 1716 ////// M1.5 ///3910 25 2024 2054 2123 S09W25 M1.9 2F 03/3901 VI/2 27 1227 1246 1249 ////// M1.0 03/3901 #--------------------------------------------------------------------# # 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 # #--------------------------------------------------------------------#