A Swarm-only night-side magnetospheric model to degree and order 3

The Swarm mission, launched in November 2013, consists of three identical satellites in near polar orbit dedicated to measuring the Earth's magnetic field to very high accuracy. Two satellites fly at a lower altitude in close orbital proximity while the third flies at a higher altitude producing a steady local time drift. The unique configuration allows a wide set of new models of the various sources of the field to be created from core to magnetosphere. In this study, we separate the magnetic field sources measured at satellite altitude and produce a model of the night-side magnetosphere. This model can be used to study the magnetosphere during storm time to see how it responds to external forcing. Additionally, we observe seasonal variations of the quiet-time configuration. We find good agreement with previous studies during both quiet and storm periods, and we are able to produce these complete models in a timely fashion, making a high-resolution and near real-time characterisation of the magnetosphere configuration possible.