:Issued: 2025 Oct 22 0822 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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A halo coronal mass ejection (SIDC CME 583) was observed in SOHO/LASCO-C2 imagery
starting at 20:24 UTC on October 21. The CME is directed primarily toward the
northwest from Earth's perspective and was associated with type II and type IV radio
emissions, detected at 20:07 UTC and 20:11 UTC, respectively. Analysis indicates that
the source of the CME was located on the far side of the Sun and is not expected to
arrive at Earth. The greater than 10 MeV proton flux, as measured by GOES-18, began
to increase from 00:00 UTC on October 22, likely in association with this event, but
has remained below the 10 pfu threshold. The proton flux is expected to remain
elevated, with a chance of exceeding the minor storm threshold in the coming days.
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