:Issued: 2026 Aug 12 1230 UTC :Product: documentation at http://www.sidc.be/products/xut #--------------------------------------------------------------------# # GEOALERT message from the SIDC (RWC-Belgium) # #--------------------------------------------------------------------# GEOALERT BRU224 UGEOA 30512 60812 1230/ 9930/ 11122 20122 30122 99999 PLAIN PREDICTIONS FOR 12 Aug 2026 10CM FLUX: 098 / AP: 010 PREDICTIONS FOR 13 Aug 2026 10CM FLUX: 104 / AP: 006 PREDICTIONS FOR 14 Aug 2026 10CM FLUX: 106 / AP: 018 Solar Active Regions and flaring: Solar flaring activity was low over the past 24 hours, with only four C-class flares identified. The newly-numbered SIDC Sunspot Group (SG) 940 (NOAA Active Region [AR] 4507, Beta magnetic configuration) and SIDC SG 941 (NOAA AR 4508, Alpha magnetic configuration) produced two C-class flares each. The brightest flare of the past 24 hours was SIDC flare 8348, a C2 emitted from SIDC SG 940 and peaked on 22 Aug at 23:04 UTC. More C-class flaring activity is expected in the next 24 hours. Coronal mass ejections: No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours. Coronal holes: SIDC Coronal Hole (CH) 174 is a northern, middle-latitude, elongated, irregular, positive polarity structure. It started crossing the solar central meridian on 10 Aug, but it was considered too weak to cause a geo-effective High Speed Stream (HSS). However, the structure has intensify since and it is now likely that it is associated with a HSS capable of reaching the Earth. As SIDC CH 174 it still crossing the central meridian, the said HSS is considered to be Earth-directed and to arrive at Earth on 14 Aug. Solar wind: The glancing blow that arrived on 11 Aug at 10:34 UTC has now subsided and the Solar Wind (SW) conditions are now closer to a typical slow SW regime. The SW speed marginally increased from 420 to 460 km/s, the interplanetary magnetic field (B) ranged dropped to 5 nT, and its North- South component (Bz) varies between -5 and 3 nT. Similar conditions are expected to register in the next 24 hours. Geomagnetism: The geomagnetic conditions of the past 24 hours ranged between quiet and unsettled levels both globally and locally (NOAA Kp 1+ to 3+ and K BEL 2 to 3). Similar conditions are expected in the next 24 hours. Proton flux levels: The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at nominal levels over the past 24 hours and is likely to remain so in the next 24 hours. Electron fluxes at GEO: The greater than 2 MeV electron flux, as measured by GOES 19, was below the 1000 pfu alert threshold for past 24 hours. It is expected to remain at the same levels in the next 24 hours. The electron fluence was at normal levels in the past 24 hours and it is expected to remain at the same levels in the next 24 hours. TODAY'S ESTIMATED ISN : 074, BASED ON 23 STATIONS. 99999 UGEOI 30512 60812 1230/ 11/// 1//// 2096/ 3011/ 4//// 8//// 9//// 99999 NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES NONE END UGEOR 30512 60812 1230/ ///// ///// 99999 USSPS 32404 09056 05222 03001 30217 11306 04000 21221 1/803 05001 47814 11303 USSPS 21305 10165 04032 16002 30717 01208 17000 20420 0/101 19000 14509 0/101 USSPS 81202 11009 03832 79001 31517 01204 81001 15704 01202 82003 17906 3/802 UMAGF 30503 60812 1004/ 11062 1/016 20233 32123 UMAGF 31523 60812 0000/ 11008 1/011 21103 33432 #--------------------------------------------------------------------# # 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 # #--------------------------------------------------------------------#