Toward more complete magnetic gradiometry with the Swarm mission

Stavros Kotsiaros

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Abstract

An analytical and numerical analysis of the spectral properties of the gradient tensor, initially performed by Rummel and van Gelderen (Geophys J Int 111(1):159–169, 1992) for the gravity potential, shows that when the tensor elements are grouped into sets of semi-tangential and pure-tangential parts, they produce almost identical signal content as the normal element. Moreover, simple eigenvalue relations can be derived between these sets and the spherical harmonic expansion of the potential. This theoretical development generally applies to any potential field. First, the analysis of Rummel and van Gelderen (1992) is adapted to the magnetic field case and then the elements of the magnetic gradient tensor are estimated by 2 years of Swarm data and grouped into ΓΓ(1)={[∇∇B]rθ,[∇∇B]rφ} resp. ΓΓ(2)={[∇∇B]θθ−[∇∇B]φφ,2[∇∇B]θφ}. It is shown that the estimated combinations ΓΓ(1) and ΓΓ(2) produce similar signal content as the theoretical radial gradient ΓΓ(0)={[∇∇B]rr}. These results demonstrate the ability of multi-satellite missions such as Swarm, which cannot directly measure the radial gradient, to retrieve similar signal content by means of the horizontal gradients. Finally, lithospheric field models are derived using the gradient combinations ΓΓ(1) and ΓΓ(2) and compared with models derived from traditional vector and gradient data. The model resulting from ΓΓ(1) leads to a very similar, and in particular cases improved, model compared to models retrieved by using approximately three times more data, i.e., a full set of vector, North–South and East–West gradients. This demonstrates the high information content of ΓΓ(1).
Original languageEnglish
Article number130
JournalEarth, Planets and Space
Volume68
Number of pages13
ISSN1343-8832
DOIs
Publication statusPublished - 2016

Bibliographical note

2016 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Keywords

  • Crustal field
  • Swarm gradients
  • Field modeling

Cite this

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title = "Toward more complete magnetic gradiometry with the Swarm mission",
abstract = "An analytical and numerical analysis of the spectral properties of the gradient tensor, initially performed by Rummel and van Gelderen (Geophys J Int 111(1):159–169, 1992) for the gravity potential, shows that when the tensor elements are grouped into sets of semi-tangential and pure-tangential parts, they produce almost identical signal content as the normal element. Moreover, simple eigenvalue relations can be derived between these sets and the spherical harmonic expansion of the potential. This theoretical development generally applies to any potential field. First, the analysis of Rummel and van Gelderen (1992) is adapted to the magnetic field case and then the elements of the magnetic gradient tensor are estimated by 2 years of Swarm data and grouped into ΓΓ(1)={[∇∇B]rθ,[∇∇B]rφ} resp. ΓΓ(2)={[∇∇B]θθ−[∇∇B]φφ,2[∇∇B]θφ}. It is shown that the estimated combinations ΓΓ(1) and ΓΓ(2) produce similar signal content as the theoretical radial gradient ΓΓ(0)={[∇∇B]rr}. These results demonstrate the ability of multi-satellite missions such as Swarm, which cannot directly measure the radial gradient, to retrieve similar signal content by means of the horizontal gradients. Finally, lithospheric field models are derived using the gradient combinations ΓΓ(1) and ΓΓ(2) and compared with models derived from traditional vector and gradient data. The model resulting from ΓΓ(1) leads to a very similar, and in particular cases improved, model compared to models retrieved by using approximately three times more data, i.e., a full set of vector, North–South and East–West gradients. This demonstrates the high information content of ΓΓ(1).",
keywords = "Crustal field, Swarm gradients, Field modeling",
author = "Stavros Kotsiaros",
note = "2016 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.",
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language = "English",
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journal = "Earth, Planets and Space",
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Toward more complete magnetic gradiometry with the Swarm mission. / Kotsiaros, Stavros.

In: Earth, Planets and Space, Vol. 68, 130, 2016.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Toward more complete magnetic gradiometry with the Swarm mission

AU - Kotsiaros, Stavros

N1 - 2016 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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N2 - An analytical and numerical analysis of the spectral properties of the gradient tensor, initially performed by Rummel and van Gelderen (Geophys J Int 111(1):159–169, 1992) for the gravity potential, shows that when the tensor elements are grouped into sets of semi-tangential and pure-tangential parts, they produce almost identical signal content as the normal element. Moreover, simple eigenvalue relations can be derived between these sets and the spherical harmonic expansion of the potential. This theoretical development generally applies to any potential field. First, the analysis of Rummel and van Gelderen (1992) is adapted to the magnetic field case and then the elements of the magnetic gradient tensor are estimated by 2 years of Swarm data and grouped into ΓΓ(1)={[∇∇B]rθ,[∇∇B]rφ} resp. ΓΓ(2)={[∇∇B]θθ−[∇∇B]φφ,2[∇∇B]θφ}. It is shown that the estimated combinations ΓΓ(1) and ΓΓ(2) produce similar signal content as the theoretical radial gradient ΓΓ(0)={[∇∇B]rr}. These results demonstrate the ability of multi-satellite missions such as Swarm, which cannot directly measure the radial gradient, to retrieve similar signal content by means of the horizontal gradients. Finally, lithospheric field models are derived using the gradient combinations ΓΓ(1) and ΓΓ(2) and compared with models derived from traditional vector and gradient data. The model resulting from ΓΓ(1) leads to a very similar, and in particular cases improved, model compared to models retrieved by using approximately three times more data, i.e., a full set of vector, North–South and East–West gradients. This demonstrates the high information content of ΓΓ(1).

AB - An analytical and numerical analysis of the spectral properties of the gradient tensor, initially performed by Rummel and van Gelderen (Geophys J Int 111(1):159–169, 1992) for the gravity potential, shows that when the tensor elements are grouped into sets of semi-tangential and pure-tangential parts, they produce almost identical signal content as the normal element. Moreover, simple eigenvalue relations can be derived between these sets and the spherical harmonic expansion of the potential. This theoretical development generally applies to any potential field. First, the analysis of Rummel and van Gelderen (1992) is adapted to the magnetic field case and then the elements of the magnetic gradient tensor are estimated by 2 years of Swarm data and grouped into ΓΓ(1)={[∇∇B]rθ,[∇∇B]rφ} resp. ΓΓ(2)={[∇∇B]θθ−[∇∇B]φφ,2[∇∇B]θφ}. It is shown that the estimated combinations ΓΓ(1) and ΓΓ(2) produce similar signal content as the theoretical radial gradient ΓΓ(0)={[∇∇B]rr}. These results demonstrate the ability of multi-satellite missions such as Swarm, which cannot directly measure the radial gradient, to retrieve similar signal content by means of the horizontal gradients. Finally, lithospheric field models are derived using the gradient combinations ΓΓ(1) and ΓΓ(2) and compared with models derived from traditional vector and gradient data. The model resulting from ΓΓ(1) leads to a very similar, and in particular cases improved, model compared to models retrieved by using approximately three times more data, i.e., a full set of vector, North–South and East–West gradients. This demonstrates the high information content of ΓΓ(1).

KW - Crustal field

KW - Swarm gradients

KW - Field modeling

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DO - 10.1186/s40623-016-0498-x

M3 - Journal article

VL - 68

JO - Earth, Planets and Space

JF - Earth, Planets and Space

SN - 1343-8832

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ER -