Interplanetary and geomagnetic data for C03 event (29 October 2003). From top to bottom: interplanetary magnetic field measured by ACE spacecraft at L1 point (four top panels, magnitude and XYZ GSM components). Bottom panel shows the magnetic disturbance at the Earth’s surface (SYM-H index and THY observatory). Two different time-lines in horizontal axis have been set: top labels correspond to ACE data (four top panels) and bottom labels correspond to ground data (bottom panel). Interplanetary plots are shifted 14 min (see text for details) relative to ground plots. Vertical solid line S marks shock discontinuity. Vertical solid line S and dashed line T mark southward turnings of B_z.