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Table 1.

Correspondence of terminologies for viscous modes in shear flows.

Differential rotation 2D hydrodynamics Differential rotation Solar observations
(on a sphere, this paper) (plane Poiseuille flow) (β-plane approximation)
Rossby Rossby (1939, no viscosity) Löptien et al. (2018)
High-latitude A family or “wall modes” (Mack 1976) Gizon et al. (2020) Gizon et al. (2021)
Critical-latitude P family or “center modes” (Pekeris 1948) Gizon et al. (2020) Gizon et al. (2021)
Strongly damped S family or “damped modes” (Schensted 1961) Gizon et al. (2020)

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