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Just before 18:00 UTC Monday a Coronal Mass Ejection (CME) swept past the Ace Spacecraft and a Sudden Geomagnetic Impulse was detected shortly after. The solar wind reached near 550 km/s at its peak and the Bz tilted sharply north and then south for long durations. Moderate to Strong geomagnetic storming reaching close to the G3 Level took place at high latitudes.