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. 2021 Dec 10;43(1):229–261. doi: 10.1007/s10712-021-09681-1

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© The Author(s) 2021

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Fig. 7 — Spectrogram from PIV measurements performed on the Cottbus spherical Couette experiment (Hoff et al. 2016). The Ekman number is $E k = 1.52 \times 10^{- 5}$ . EA means equatorial antisymmetric. Broadband background turbulence appears here when $Δ Ω / Ω \leq - 1.75$ . The figures on the top show flow renderings from simulations (Barik et al. 2018)