Systematic evaluation of ground and geostationary magnetic field predictions generated by global magnetohydrodynamic models

摘要

In this work a systematic evaluation of ground and geostationary magnetic fieldpredictions generated by a set of global magnetohydrodynamic (MHD) models is carriedout. The evaluation uses four geospace storm events and ground magnetometer station andgeostationary GOES data for comparisons between model output and observations. It isshown that metrics analysis of two different geospace parameters, i.e., geostationaryand ground magnetic field, show surprising similarities, although the parameters reflectrather different properties of geospace. More specifically, increasing the spatial resolutionand inclusion of more realistic inner magnetospheric physics successfully made themodel predictions by the BATS-R-US model more accurate. Furthermore, while theOpenGGCM model had a tendency to have larger differences to observations thanBATS-R-US in terms of the prediction efficiency, the model provided more accuraterepresentation of the observed spectral characteristics of the ground and geostationarymagnetic field fluctuations.