Magnetic-field control of large-scale flow sizes at Earth-like parameters

Determine how the Earth’s dipolar magnetic field influences the size of large-scale flow structures in rotating magnetoconvection within the Tangent Cylinder at Earth-like criticalities and low-Prandtl-number conditions where oscillatory modes are prevalent.

Background

At Earth-like low Prandtl numbers, oscillatory magnetoconvective modes alter the onset and dynamics, complicating predictions about the characteristic sizes of large-scale structures. The authors highlight that the influence of the dipolar magnetic field on these scales is not established under such conditions.

This uncertainty persists despite theoretical and numerical progress on magnetostrophic convection and MHD turbulence, underscoring the need for targeted studies that bridge rotating convection and magnetic field effects at core-relevant parameter regimes.