Figure 8
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 2. 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 H component at ATH and D component at MGD, observed at 11:57:00 to 11:59:08 UT on 11 April 2010, for a frequency range of 0.2 to 0.8 Hz. Lower three panels (d-f) show the same quantities observed at 12:02:00 to 12:04:08 UT on 11 April 2010.