Welcome to space weather, issued by XMDV radio at Thu the 04 Dec 2025 at 19:59:49

In the last 24 hours Solar activity reached high levels with an isolated M6.0 to 1F flare thatpeaked at 04 to 0250 utc and originated at Region 4300 . This flare was associated with an eruption observed inGOES to SUVI 284A imagery and, later, in the available coronagraph data. Apreliminary model run indicates that this coronal mass ejection propagation path is notEarth-directed. A type-II radio sweep was observed around this M6.0 flare peak time by two USAF to RSTN stations, with estimated speeds of 345 and 484 kilometers per second. Multiple radio bursts and radio noise storms were observedduring the period, including a Type-IV radio sweep at 04 to 0832 utc. Other seven active regions remained in the visible solar disk, contributing with the measured C-level background activity. It is worthhighlighting the growth of the Region 4301 andRegion 4296 , which was responsible forthe second largest flare of the period: a C9.2 peaked at 04 to 0016 utc. Despite the eruption described above and the earlier filament eruptionfirst observed at the southwest quadrant at 03 to 1106 utc , no other coronal mass ejections were observed in the availablecoronagraph imagery. Isolated to occasional M-class flares are expected through 06 Dec, with a chance for X-class flares , given past flare history and thepotential of current active regions on the disk.

In the last 24 hours The greater than 2 mega electron volt electron flux in geosynchronous orbit returned tomoderate levels abruptly around 03 to 1845 utc and remained belowthreshold, after reaching high levels . The greater than 10 mega electron volt proton flux in geosynchronous orbit remained atbackground levels. The greater than 2 mega electron volt electron flux is expected to remain at moderatelevels 04 to 05 Dec, returning to high levels on 06 december due to theanticipated IMF sector crossing as Earth leaves the ongoing -CH to HSSinfluences. A slight change for a greater than 10 mega electron volt proton flux enhancementabove 10 pfu is considered through 06 december due to the flare potential ofthe eight active regions currently visible at the solar disk.

In the last 24 hours Solar wind parameters responded to the anticipated arrival of bothnegative CH to HSS and embedded coronal mass ejection during the period. Phi angle became predominantly negative afterabout 03 to 1915 utc, indicating an IMF sector with field lines pointingtoward the Sunday . The solarwind density increased about 3 times the nominal levels after that, reaching a maximum value around 03 to 1945 utc. Around that time, the solarwind speed was below 500 kilometers per second, the total IMF was near its maximum of 20 nano tesla, with Bz component reaching its most negative level of to 15 nano tesla. Thesesuggested an additional influence of the coronal mass ejection passage near Earth. Afterthat, the solar wind speed increased to about 700 kilometers per second, while thedensity and total magnetic field decreased to levels compatible with aHSS regime. The solar wind environment is anticipated to remain disturbed by thenegative CH to HSS influences through 06 Dec, returning to nominal levelson 07 december.

In the last 24 hours Geomagnetic activity was predominantly at minor storming levelsduring the past 24 h, with a two active synoptic periods and a single major storming period at 03 to 1800 to 2100. The major storming period was likely theresult of the combined influence of the negative CH to HSS arrival and thecoronal mass ejection that left the Sunday on 01 december. The geomagnetic field will likely to remain at storming levels until theend of 04 Dec, returning to active conditions on 05 to 06 december and reachingunsettled levels on 07 Dec, as the influence of the CH to HSS wanes.

This has been space weather, issued by XMDV radio at Thu the 04 Dec 2025 at 19:59:49

Space weather was created by William Greenwood with material from the N O double A