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Issued on 2023 Dec 17 1233 UTC
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.