Error enhancement in geomagnetic models derived from scalar data

Stern, David P.; Bredekamp, J. H.

doi:10.1029/ja080i013p01776

Cited by 54 publications

(21 citation statements)

References 12 publications

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“…Models derived from magnetic intensity data alone suffer from the Backus effect (e.g., Backus 1970;Stern and Bredekamp 1975). The high-degree lithospheric field coefficients of the models SIFM and SIFM x are primarily constrained by scalar gradient data, which do not provide information concerning small-scale features at low latitudes.…”

Section: Resultsmentioning

confidence: 99%

A model of Earth’s magnetic field derived from 2 years of Swarm satellite constellation data

et al. 2016

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More than 2 years of magnetic field data taken by the three-satellite constellation mission Swarm are used to derive a model of Earth's magnetic field and its time variation. This model is called SIFMplus. In addition to the magnetic field observations provided by each of the three Swarm satellites, explicit advantage is taken of the constellation aspect of Swarm by including East-West magnetic intensity and vector field gradient information from the lower satellite pair. Along-track differences of the magnetic intensity as well as of the vector components provide further information concerning the North-South gradient. The SIFMplus model provides a description of the static lithospheric field that is very similar to models determined from CHAMP data, up to at least spherical harmonic degree n = 75. Also the core field part of SIFMplus, with a quadratic time dependence for n ≤ 6 and a linear time dependence for n = 7-15, demonstrates the possibility to determine high-quality field models from only 2 years of Swarm data, thanks to the unique constellation aspect of Swarm. To account for the magnetic signature caused by ionospheric electric currents at polar latitudes we co-estimate, together with the model of the core, lithospheric and large-scale magnetospheric fields, a magnetic potential that depends on quasi-dipole latitude and magnetic local time.

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Section: Resultsmentioning

confidence: 99%

A model of Earth’s magnetic field derived from 2 years of Swarm satellite constellation data

et al. 2016

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“…Backus (1970) proved that for a primarily dipole magnetic field, inversion from intensity data alone is formally non-unique, as two nontrivially different potential fields yield the same intensity everywhere on a spherical surface. Stern and Bredekamp (1975) demonstrated that this formal non-uniqueness was closely related to the discrepancies in the POGO field models. Lowes (1975) described the link between the two particularly clearly, in terms of the perpendicular error effect.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field modelling from scalar-only data: Resolving the Backus effect with the equatorial electrojet

2005

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It is well known that models of the global geomagnetic field constructed from only measurements of the field intensity suffer from large errors arising from the Backus or perpendicular error effect. Knowledge of the location of the magnetic dip equator is in principal sufficient to eliminate this error. We investigate constraining the location of the dip equator using observations of the equatorial electrojet in intensity measurements made from the CHAMP satellite. While the models generated are inferior compared with models obtained from oriented three-component vector data, they may be of sufficient quality to allow construction of future global geomagnetic reference models in the absence of vector data.

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“…In the past, such data were limited to the total field measurements only and as Stern and Bredekamp (1974) have noted the models based on these measurements may be very precise in representing total field values at satellite altitudes, but they may be deficient in determining accurate vector values. Such deficiencies, however, are expected to be removed from the analysis of MAGSAT satellite data, which is to provide vector field measurements as well as the total field values.…”

Section: 'mentioning

confidence: 99%

An Overview of Geomagnetic Field Models

Regan¹

1980

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Error enhancement in geomagnetic models derived from scalar data

Cited by 54 publications

References 12 publications

A model of Earth’s magnetic field derived from 2 years of Swarm satellite constellation data

A model of Earth’s magnetic field derived from 2 years of Swarm satellite constellation data

Magnetic field modelling from scalar-only data: Resolving the Backus effect with the equatorial electrojet

An Overview of Geomagnetic Field Models

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