:Issued: 2024 May 01 0614 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 shock was detected in the solar wind ACE data around 11:34 UTC on April 30. The
interplanetary magnetic field increased from 3 nT to 6 nT and the solar wind speed
jumped from 380 km/s to 420 km/s. The solar wind density at the shock increased from
4/cm3 to 10/cm3, and the temperature jumped from about 1.4e4 K to 1.02e5 K. The shock
is possibly related to an ICME arrival related to a faint slow CME detected in
LASCO/C2 data around 11:00 UTC on April 27. Geomagnetic conditions are expected to be
disturbed with unsettled to active conditions possible depending on the Bz.
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