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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

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

Fig. 2

Wavelet power spectra of time series of a IEFy, b SYM-H, c AE, d PC, and e \(V_d\) from 12:00 UT, 11 November to 12:00 UT, 17 November 2003. The right panels show the wavelet spectra of corresponding parameters from 16:00 UT, 27 March to 16:00 UT, 01 April 2017. The corresponding power and GWS are also shown in each panel with 95% significance level (red line). The cone of influence (COI) is indicated by white-dashed lines. It is to be noted that the wavelet spectra for both events show the highest peak in the GWS at \(\sim\)1.5–2 h. The black dashed-line is marked at 1.5 h period. The concomitant occurrence of the 1.5–2 h periodicity in IEFy, SYM-H, AE, PC, and \(V_d\) implies possible global oscillations during the HILDCAA events

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