Overview of the detected waves. Top: 8 s average trace spectrum for the detected events versus the event number, with their distance from the Sun on the top. Dashed white line indicate 0.1f_ce and the violet one the lower hybrid frequency, f_LH. Middle: magnetic field PSD at the frequency corresponding to the maximal power for each detected wave packet. The noise level is indicated by the plain black line, and three times the noise by the dashed line. The color indicates the angle between the k angle and the background magnetic field. Bottom: phase shift between the B_y and B_z magnetic components versus the angle between the k vector and the radial direction. The color indicates the angle between the k angle and the background magnetic field.