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Fig. 3


Power spectrum of the [750−2050 μHz] power spectrum of the time series. It is equivalent to the square of the envelope of the autocorrelation of the time series  |AC2, and is computed as the Fourier transform of the power spectrum filtered with a tapered cosine window centered on 1400 μHz and with 650 μHz half-window. It is normalized such that |AC(0)|2 = 1, then filtered for correlation times lower than 0.3 h. On one hand, 4 peaks, labeled (1/2, 1, 2, 3) , are associated with the mean spacing of the modes: Δν0 = 155.3 ± 2.2 μHz. The corresponding period, 1.789 ± 0.026 h, matches twice the sound speed transit time between the centre and the surface of Jupiter. On the other hand, the second highest peak at 5.030 h almost matches twice the Jovian rotation period νjup, a spacing that is compatible with the mode splitting between positive and negative azimuthal orders (e.g. l, m = 1, +1 and l,m = 1, −1).

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