:Issued: 2023 Dec 25 1341 UTC
:Product: documentation at http://www.sidc.be/products/presto
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# FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium)         #
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The automated coronal mass ejection (CME) detection tool by CACTUS has reported a
halo CME with an estimated launch time around 14:00 UTC on Dec 24th. In reality this
detection consists of two separate CMEs related to filament eruptions in the
north-west and the south-east quadrant. The first lift off was visible in the LASCO
C2 coronagraph images before UTC noon on Dec 24th with the second CME launching
around 15:48 UTC on Dec 24th. Both CMEs have clear on-disc signatures and are
accompanied by a coronal dimming. An initial analysis suggests a possible combined
glancing blow arrival from these CMEs on Dec 27th. Should the CMEs arrive, active
geomagnetic conditions are expected with possible isolated minor storm levels on Dec
27th - Dec 28th.
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