The electrodynamic energy budgets of induced and intrinsic magnetospheres

NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft has spent the last 5 years in Mars' orbit, characterizing the planet's interaction with the solar wind using a comprehensive suite of instruments. We combine in-situ magnetic field and particle measurements from MAVEN to estimate the average total electrodynamic power induced in the interaction between the solar wind and Mars. This estimate provides an upper limit to the amount of power available to drive atmospheric Joule heating and ion escape in the quasi-steady-state (DC) component of the solar wind interaction. The energy budget of the Martian induced magnetosphere and the associated Poynting flux into the ionosphere will be compared with analogous estimates for the Earth to constrain the role of the geomagnetic field in planet-solar wind coupling.