The Swarm Initial Field Model – a Model of the Earth’s Magnetic Field for 2014 Determined From One Year of Swarm Satellite Constellation Data

Nils Olsen, Gauthier Hulot, Vincent Lesur, Chris Finlay, Ciaran Beggan, Amaud Chulliat, Terence Sabaka

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Abstract

Almost one year of data from ESA's Swarm constellation mission are used to derive a model of the Earth’s magnetic field and its time variation (secular variation). The model describes contributions from the core and lithosphere as well as large-scale contributions from the magnetosphere (and its Earth-induced counterpart). We use data from geomagnetic quiet times (Kp less than 2o, time change of Dst-index less than 2 nT/hr) and dark regions (sun below horizon) and co-estimate the Euler angles describing the rotation between the vector magnetometer instrument frame and the North-East-Center (NEC) frame. In addition to the magnetic field observations provided by each of the three Swarm satellites we include the East-west magnetic gradient information provided by the lower Swarm satellite pair, thereby explicitly taking advantage of the constellation aspect of Swarm. We assess the spatial and temporal model resolution that can be obtained from one year of Swarm satellite data by comparison with other recent models that also include non-Swarm magnetic observations.
Original languageEnglish
Publication date2014
Number of pages1
Publication statusPublished - 2014
Event2014 AGU Fall Meeting - San Francisco, CA, United States
Duration: 15 Dec 201419 Dec 2014

Conference

Conference2014 AGU Fall Meeting
CountryUnited States
CitySan Francisco, CA
Period15/12/201419/12/2014

Cite this

Olsen, N., Hulot, G., Lesur, V., Finlay, C., Beggan, C., Chulliat, A., & Sabaka, T. (2014). The Swarm Initial Field Model – a Model of the Earth’s Magnetic Field for 2014 Determined From One Year of Swarm Satellite Constellation Data. Abstract from 2014 AGU Fall Meeting, San Francisco, CA, United States.