:Issued: 2023 Dec 17 1233 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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At around 07:45 UTC on December 17, the magnetic field reached 16 nT (please, note
the data gap in ACE and DSCOVR data that occurred between 05:54 UTC and 07:32 UTC on
December 17). The solar wind speed increased from 445 to 550 km/s. The southward
interplanetary magnetic component, Bz, reached a minimum of -11 nT. These
disturbances most likely mark the arrival of the CMEs, that occurred on December
14-15. The ICME arrival has caused minor geomagnetic storms with NOAA Kp reaching 5-
in the interval 09-12 UTC on December 17th, while locally over Belgium only unsettled
conditions have been observed. Further minor to moderate geomagnetic storms periods
may occur in the upcoming hours.
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# Solar Influences Data analysis Center - RWC Belgium                #
# Royal Observatory of Belgium                                       #
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