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Auroral precipitation plays an important role in the magnetosphere-ionosphere-thermosphere (MIT) coupling. Various precipitation spectra have been observed and they are driven by different physical mechanisms. In this study, we report the characterization of auroral precipitation in the Multiscale Atmosphere-Geospace Environment (MAGE) model, a newly developed whole geospace model. Diffuse electron precipitation is derived with a drift-physics based ring current model, in which electron lifetime due to interactions with chorus and hiss waves is obtained with an empirical table and electron loss rate is informed by drift physics and IGRF magnetic field. Mono-energetic electron precipitation is derived from large-scale field-aligned currents and drift-physics informed loss cone rate. Broadband electron precipitation is derived from a statistical relationship between field-aligned Poynting flux and the precipitation …