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The Modelling of VLF Trimpis using both Finite Element and 3D Born modelling

The Modelling of VLF Trimpis using both Finite Element and 3D Born modelling
The Modelling of VLF Trimpis using both Finite Element and 3D Born modelling
This paper investigates the numerical modelling of VLF Trimpis produced by a D region inhomogeneity on the Great Circle Path . Two different codes are used. The first is a 2D finite element method (FEM) code , whose solutions are rigorous and valid in the strong scattering or non-Born limit. The second code is a fully 3D model that invokes the Born approximation. The predicted Trimpis from these codes compare closely, thus confirming the validity of both models. The modal scattering matrices have a comparable structure, and indicate strong scattering between the dominant TM modes. Analysis of the scattering matrix from the FEM code delineates the Born regime. For a LIE with a radius of 100kms, the Born approximation becomes invalid at an electron density perturbation of about 8 el/cc.
VLF Trimpis, Finite elements, Born modelling
0094-8276
4453-4456
Baba, K
aa70c4ae-e9cf-48a0-87ea-71ddcac22738
Nunn, D
cb6e7514-3abc-4ac7-a50d-701bb9a5ebd4
Hayakawa, M
ccc31078-38f1-4680-b53d-99bd0868ac0d
Baba, K
aa70c4ae-e9cf-48a0-87ea-71ddcac22738
Nunn, D
cb6e7514-3abc-4ac7-a50d-701bb9a5ebd4
Hayakawa, M
ccc31078-38f1-4680-b53d-99bd0868ac0d

Baba, K, Nunn, D and Hayakawa, M (1998) The Modelling of VLF Trimpis using both Finite Element and 3D Born modelling. Geophysical Research Letters, 25 (24), 4453-4456.

Record type: Article

Abstract

This paper investigates the numerical modelling of VLF Trimpis produced by a D region inhomogeneity on the Great Circle Path . Two different codes are used. The first is a 2D finite element method (FEM) code , whose solutions are rigorous and valid in the strong scattering or non-Born limit. The second code is a fully 3D model that invokes the Born approximation. The predicted Trimpis from these codes compare closely, thus confirming the validity of both models. The modal scattering matrices have a comparable structure, and indicate strong scattering between the dominant TM modes. Analysis of the scattering matrix from the FEM code delineates the Born regime. For a LIE with a radius of 100kms, the Born approximation becomes invalid at an electron density perturbation of about 8 el/cc.

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Published date: December 1998
Keywords: VLF Trimpis, Finite elements, Born modelling
Organisations: Electronics & Computer Science

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Local EPrints ID: 259015
URI: https://eprints.soton.ac.uk/id/eprint/259015
ISSN: 0094-8276
PURE UUID: bea79f2a-5ac8-4206-a8f8-8ab66363fd62

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Date deposited: 08 Mar 2004
Last modified: 18 Jul 2017 09:26

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