A testbed for geomagnetic data assimilation

SUMMARY Geomagnetic data assimilation merges past and present-day observations of the Earth’s magnetic field with numerical geodynamo models results are used to initialize forecasts. We present a new ‘proxy model’ that can be test, or rapidly prototype, techniques for geomagnetic assimilation. The basic idea constructing proxy is capture conceptual difficulties one encounters when assimilating into high-resolution, 3-D simulations, but at much lower computational cost. framework using as ‘gate-keepers’ methods could/should considered more extensive testing on operational has proven useful in weather prediction, where advances and, hence, improved forecast skill, least part enabled by common use wide range models. also large set systematic experiments reveal importance localization inflation