Electromagnetic Propulsion via Rotating Conductors in the Geomagnetic Field: Architectural Concept of a Post-Reactive Orbital Platform

This work introduces an architectural concept of an electromagnetic propulsion system that interacts with the Earth's geomagnetic field through rotating conductive structures. Unlike conventional rocket propulsion systems that generate thrust through the expulsion of reaction mass, the proposed architecture utilizes Lorentz-force interaction between electric currents and the planetary magnetic field. The system forms a dynamically controlled current loop using rotating semicircular conductors whose topology is defined by phase-controlled commutation. The resulting electromagnetic interaction produces a controllable thrust component while eliminating the need for propellant. The architecture is scalable through modular rotor units and can be interpreted as an example of a Class III propulsion system, where operational conditions are localized at the interaction interface with an existing natural field. The work presents the physical principle, architectural framework, and an experimental verification concept suitable for laboratory-scale testing. Order-of-magnitude estimates of achievable thrust levels are provided, and the relationship to electrodynamic tether concepts is discussed. Beyond a specific propulsion mechanism, the paper proposes a broader architectural framework for spacecraft propulsion based on interaction with planetary magnetic fields. The results suggest the possibility of new propulsion architectures operating across extended altitude regimes within the geomagnetic environment. Keywords: electromagnetic propulsion, Lorentz force propulsion, geomagnetic interaction, propellantless propulsion, rotating conductive structures, spacecraft propulsion architecture, planetary magnetic fields.