:Issued: 2023 Sep 01 0811 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 (CME) was observed in LASCO/C2 coronagraph data from
04:17 UTC on Sept 01. The CME is associated with an M1.2 flare originating from NOAA
AR 3411, which also caused a proton event. The CME has a possible Earth directed
component; further analysis is ongoing to better determine the expected impacts. 
The greater than 10 MeV proton flux crossed the 10 pfu threshold at 04:30 UTC on Sept
01. The proton flux is expected to remain above the threshold over the next hours.
Note also that the 13-21MeV proton flux as measured on board STEREO-A has risen, most
probably in association to this event.
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