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Issued on 2024 Dec 17 0819 UTC
A shock was observed in the solar wind at 4:40 UT (in DSCOVR data), the speed jumped from 400 to 500 km/s, and the interplanetary magnetic field from 7 to 20 nT. The shock was driven by an ICME, corresponding to the expected arrival of the CME from 14 December. Currently, the solar wind speed is near 620 km/s and the interplanetary magnetic field around 25 nT, with Bz at 23 nT (positive). For the moment, Kp has reached 5 and K_Bel 4, but more disturbed geomagnetic conditions are likely to be observed in the coming hours (in particular if Bz turns negative).