Figure 2
From: Study of Pc1 pearl structures observed at multi-point ground stations in Russia, Japan, and Canada
Spectral information in case 1. Power spectrum density of the (a) H and (b) D components of magnetic field at ATH, (c) H and (d) D components of magnetic field at MGD, and (e) H and (f) D components of magnetic field at MOS; polarization angle at (g) ATH, (h) MGD, and (i) MOS; coherence between (j) ATH H and MGD D, (k) ATH H and MOS D, and (l) MGD D and MOS D components; (m) cross correlation of the upper envelopes of Pc1 pearl structures between ATH H and MGD D components observed at 10:00 to 12:00 UT on 8 April 2010, for a frequency range of 0.4 to 1.2 Hz.