Figure 4
From: Study of Pc1 pearl structures observed at multi-point ground stations in Russia, Japan, and Canada
The PSD and the coherence of Pc1 waveforms of the H and D components in case 1. Upper three panels show the power spectrum density of (a) H component of the magnetic field at ATH and (b) D component of the magnetic field at MGD, as well as (c) coherence of Pc1 waveforms between the H component at ATH and D component at MGD, observed at 10:24:00 to 10:26:08 UT on 8 April 2010, for a frequency range of 0.4 to 1.2 Hz. Lower three panels (d-f) show the same quantities observed at 10:43:00 to 10:45:08 UT on 8 April 2010.