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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Relationship between wave-like auroral arcs and Pi2 disturbances in plasma sheet prior to substorm onset

Fig. 6

a The cross-phase correlation analysis for the decomposed Pi2 perturbations obtained by the HHT analysis for δB x , δB y , and δB z perturbations observed by Th D and Th E spacecraft, respectively. From the time series plots of the two Pi2 perturbations, the delay time is ~21 s for the Pi2 δB x disturbance (correlation coefficient is 0.79), ~28 s for the Pi2 δB y disturbance (correlation coefficient is 0.74), and ~16 s for the Pi2 δB z disturbance (correlation coefficient is 0.76) from the Th D to Th E spacecraft. b The exponential growth behavior of the peak amplitude of the Pi2 δB x , δB y , and δB z perturbations observed by Th D and Th E spacecraft

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