Fig. 13.
From: ULF waves in the outer magnetosphere: Geotail observation 1 transverse waves
(a) High-pass filtered records from high latitude stations, NAQ, IQA and PBQ, and solar wind and IMF variations observed by the ACE spacecraft (time shifted by 41.5 min) for the three hour interval from 16 h. The arrows indicate magnetic local noon at IQA and PBQ. (b) Comparison of ground and GTL PSDs in the interval from 17:20. Ground spectra are shown for the morning (top panel) and afternoon sides (second panel from the top), respectively.