From isoviscous convective experiment 'GeoFlow I' to temperature-dependent viscosity in 'GeoFlow II'-Fluid physics experiments on-board ISS for the capture of convection phenomena in Earth's outer core and mantle

► 'GeoFlow' experiments deliver benchmark possibilities for spherical Earth models. ► 'GeoFlow' is part of Fluid Science Laboratory in COLUMBUS module on-board the ISS. ► 'GeoFlow II' observes basic flow properties in the small viscosity contrast regime. ► 1-Nonanol can model the influence of the viscosity contrast on flow instabilities. ► Pattern characteristics of the isoviscous case show large scale convective cells.