A New Comprehensive Earth Magnetic Field Model Based Upon 4 Years of Swarm Satellite and Ground Observatory Data

The European Space Agency (ESA) Swarm satellite constellation mission was launched in November 2013 and is providing the best monitoring of the magnetic field of the Earth to date. The unique east-west low satellite pair allows for gradiometric measurements that are particularly sensitive to lithospheric and tidal magnetic signals, and when combined with other data sources and types, enables the separation of several magnetic sources. The well-known Comprehensive Inversion (CI) approach has been applied to the first four years of Swarm data, as well as supporting ground-observatory data, to produce a new parent magnetic field model from which ESA Swarm Level-2 data products have been extracted. The CI signal separation capabilities have resulted in a new product describing the oceanic M2 tidal magnetic field. This new product, as well as the other magnetic field products, will be discussed including future directions for the CI approach concerning Swarm data.