:Issued: 2023 Sep 11 1244 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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North-West partial halo Coronal Mass Ejections (CME) was observed in the SOHO/LASCO
coronograph images on September 10 at 17:12 UTC with an angular width of about 105
degrees and slow speed of about 225 km/s. The source of this CME is unclear. A
possible candidate is a prominence near the NOAA Active Region 3424 located on the
central meridian. In that case, a glancing blow may reach Earth not earlier than 4-5
days due to the very slow imitation speed of this CME. 

Another Est partial halo CME was observed on September 11 at 01:25 UTC with an
angular width of about 150 degrees and a speed of about 500 km/s. This CME is
associated with the M1.4-class flare and the type II radio emission that occurred in
the Catania NOAA Active Region 3429. A glancing blow may be visible in the solar wind
condition near Earth in about 3.5 days.

No other clear Earth-directed CME were observed in the SOHO/LASCO coronograph images
over the past 24 hours.
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