MHD (Magnetohydrodynamic) turbulence cascade
energy hubs" - while not an exact match, this analogy suggests a region or process that facilitates energy transfer and conversion, much like how MHD turbulence cascade refers to the generation of smaller-scale, more energetic magnetic waves.
Technical definition
the process by which large-scale magnetic fields in the solar wind are broken down into smaller scales through interactions with turbulent eddies, enabling dissipation of energy at ion-scales.