Scales of convection on the Sun

Type of observation Granules Mesogranules Supergranules Giant cells
Horizontal velocity 1400 m/s ? 300 m/s 25 m/s
Vertical velocity 900 m/s 60 m/s 35 m/s ?
Horizontal length scale 1.4 Mm 7.0 Mm 30 Mm 340 Mm
Cell lifetime 0.07 hours 2.0 hours 25 hours 1800 hours
Turnover time 0.30 hours ? 30 hours 3800 hours
theory
Squared Mach # 0.11 ? 1.4e-5 1.6e-7
Rossby # 167 ? 1.67 0.012

Rossby number of Jupiter's Great Red Spot: 0.015