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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Evidence for presence of a global quasi-resonant mode of oscillations during high-intensity long-duration continuous AE activity (HILDCAA) events

Fig. 3

Harmonic analyses of 2003 (left panel) and 2017 (right panel) events. Top three panel show the Lomb–Scargle normalized periodograms for a IEFy, and b Vd, where the black dashed horizontal line shows the 95% confidence limit. The 3rd panel represents the squared coherency (black) with the phase spectra (red) between two time series c IEFy and Vd. The horizontal black dashed lines in c, f are marked at 90% false alarm level. The rectangular grey box is marked to show the common periodic components, where the time series of IEFy, and Vd show significant coherency with stable phase relationship (essential to infer causal relationship). JRO, Jicamarca Radio Observatory

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