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Table 1 Dimensionless parameters. Typical values for experiments and simulations, along with estimated values for the Earth’s core. Values for the Earth’s core from Olson (2013)

From: Liquid sodium models of the Earth’s core

Parameter Symbol Definition Experiments Simulations Earth’s outer core
Magnetic Prandtl number Pm ν/η < 10−5 >10−3 10−5
Reynolds number Re U L/ν < 108 < 106 108
Magnetic Reynolds number Rm U L/η < 103 < 104 300–1000
Rossby number Ro Δ Ω/Ω > 10−5 > 10−5 10−5
Ekman number E ν/Ω L 2 > 10−8 > 10−6 10−14