A New Fast Calculation Method for Pedersen and Hall Conductances From Maxwellian Electron Precipitation: Incorporating Magnetic Field Dependence

Accurate and efficient calculation of ionospheric conductances from electron precipitation is crucial for large‐scale magnetosphere‐ionosphere coupling studies. Early parameterization models, derived from simplistic particle transport calculations under very limited background conditions, suffered from significant uncertainties. To address these limitations, we systematically compute electron impact effects under nearly 2 million diverse background scenarios, encompassing variations in geomagnetic field strength and atmospheric conditions. These scenarios are generated by varying geographic location, solar and geomagnetic activity, local time, and season. From these calculations, we derive altitude‐dependent Pedersen and Hall conductivities, which are integrated over height to yield conductances. Our results show that ionospheric conductances depend not only on precipitation characteristics but also strongly on the local background geomagnetic field strength, which can lead to several‐fold variations in conductances under identical precipitation conditions. This finding highlights the importance of accounting for geomagnetic field spatial variations when constructing global conductance distributions. To enable efficient application of these results, we develop a parameterization for Maxwellian electron precipitation with average energies of 1–20 keV, achieving fitting errors within 5%, a substantial improvement over earlier models with discrepancies ranging from % to 25%. Furthermore, we show that average energy alone is insufficient to characterize precipitation conditions. Differences in spectral shapes, even at the same average energy, can produce order‐of‐magnitude variations in conductances, particularly for Hall conductance at low energies. This work provides both a robust tool for global applications and new insights into ionospheric conductance variability.