Abstract
The European Space Agency’s three-satellite constellation Swarm, launched in November 2013, has provided unprecedented monitoring of Earth’s magnetic field via a unique set of gradiometric and multi-satellite measurements from low Earth orbit. In order to exploit these measurements, an advanced “comprehensive inversion” (CI) algorithm has been developed to optimally separate the various major magnetic field sources in the near-Earth regime. The CI algorithm is used to determine Swarm Level-2 (L2) magnetic field data products that include the core, lithospheric, ionospheric, magnetospheric, and associated induced sources. In addition, it has become apparent that the CI is capable of extracting the magnetic signal associated with the oceanic principal lunar semidiurnal tidal constituent M_2 to such an extent that it has been added to the L2 data product line. This paper presents the parent model of the Swarm L2 CI products derived with measurements from the first 4 years of the Swarm mission and from ground observatories, denoted as “CIY4,” including the new product describing the magnetic signal of the M_2 oceanic tide.
Highlights
It has been over 4 years since the launch of the European Space Agency (ESA) Swarm mission on November, 22, 2013 whose objective is to provide the best-ever survey of Earth’s magnetic field
The magnetic data products include models of the core, lithospheric, nonpolar ionospheric and large-scale magnetospheric fields derived using two Sabaka et al Earth, Planets and Space (2018) 70:130 independent chain branches: several Dedicated Inversion (DI) chains (e.g., Rother et al 2013; Thébault et al 2016; Chulliat et al 2016) in which the various sources are determined in a sequential approach after removing models describing the other sources, and the Comprehensive Inversion” (CI) chain where the various data products are co-estimated
This paper reports on the CIY4 model and the associated L2 magnetic field products, including the new M2 field
Summary
It has been over 4 years since the launch of the European Space Agency (ESA) Swarm mission on November, 22, 2013 whose objective is to provide the best-ever survey of Earth’s magnetic field. The magnetic data products include models of the core, lithospheric, nonpolar ionospheric and large-scale magnetospheric fields derived using two Sabaka et al Earth, Planets and Space (2018) 70:130 independent chain branches: several Dedicated Inversion (DI) chains (e.g., Rother et al 2013; Thébault et al 2016; Chulliat et al 2016) in which the various sources are determined in a sequential approach after removing models describing the other sources, and the CI chain where the various data products are co-estimated
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