Fig. 12.
Equatorial acceleration −∂yQxy obtained by superposition of nine viscous R modes for kR = 7, 8, …15 (solid blue curve). The dot-dashed and dashed curves show −∂y⟨uxuy⟩ for supergranulation (Hanasoge et al. 2016, their Fig. 10) and larger-scale convection (Hathaway et al. 2013), respectively. For reference, the solar “torsional oscillation” has a typical amplitude of about ±5 m s−1 (see, e.g., Lekshmi et al. 2018).
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