Welcome to space weather, issued by XMDV radio at Wed the 18 Mar 2026 at 21:00:00

In the last 24 hours Solar activity reached to moderate levels, with an M2.7 at 18 to 0842 utcfrom Region 4392 . The region had been variablewith periods of growth and decay the past two days; however, today ithas primarily undergone decay while it retained a mildly mixed magneticconfiguration. Region 4391 reemerged, but isexhibiting signs of decay. The remaining regions were mainly stable andchanged little. New Region 4397 came around the Elimb and was numbered, though its classification is tentative to dueforeshortening effects. The M2.7 was accompanied by a tenflare and Type II radio burst with anestimated velocity of 740 to 860 kilometers per second. An EUV wave is visible in GOES SUVI, along with faint field line movement in the north west quadrant. The associatedcoronal mass ejection became visible in STEREO A COR2 at 18 to 0923 utc, during a SOHO LASCOdata gap. Modeling is currently ongoing. An EUV wave also accompanied a C3.9 flare at 18 to 0123 utc, also fromRegion 4392, visible in various GOES SUVI channels. However, no coronal mass ejectionsignatures were observed in available imagery, potentially due to datagaps, earthshine interference, and the disk center source location. Solar activity is expected to be low, with a chance for M-class level events 18 to 20 march due primarily to the minorinstability and variability of Region 4392.

In the last 24 hours The greater than 2 mega electron volt electron flux reached high levels again, with apeak of 2, 230 pfu at 17 to 1715 utc. The greater than 10 mega electron volt proton fluxcontinued at background levels. The greater than 2 mega electron volt electron flux is likely to reach high levels yetagain on 18 march. A brief return to normal-moderate levels on 19 to 20 Maris expected due to a likely coronal mass ejection arrival. Thegreater than 10 mega electron volt proton flux is expected to continue at backgroundvalues, with a slight chance for an S1 level event 19 to 20 march dueto possible coronal mass ejection shock enhancement influences.

In the last 24 hours Solar wind parameters were indicative of a gradual return to a slowregime. Total IMF strength was at normal levels of mainly 4 to 5 nano tesla, and

Bz component was predominantly northward. Solar wind speed decreasedfrom peaks around 500 kilometers per second to around 400 kilometers per second. The phi angle waspredominantly positive. The solar wind environment is anticipated to transition to a near normalregime through 18 march. An anticipated coronal mass ejection arrival near midday on 19 Maris expected to enhance solar wind speed and total IMF strength. coronal mass ejectionpassage is likely to continue into 20 march with the additional factors oftwo other nearby coronal mass ejections passing by close to Earth, as well as a possiblesolar sector boundary crossing . All this is likely to lead to acomplicated and amplified solar wind regime 19 to 20 march and beyond.

In the last 24 hours The geomagnetic field was quiet. Quiet to unsettled conditions are expected on 18 march as positivepolarity coronal hole high speed stream influences end. The geomagnetic field is likely tobecome disturbed on 19 Mar, with G2 storm levels likely uponand after the anticipated coronal mass ejection arrival. Active to G1 stormconditions are likely on 20 march due to continuing but weakening coronal mass ejectionpassage influences.

This has been space weather, issued by XMDV radio at Wed the 18 Mar 2026 at 21:00:00

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