The modelling of VLF Trimpis using both finite element and 3D Born Modelling | Zendy

Baba K. | Zendy; Nunn D. | Zendy; Hayakawa M. | Zendy

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The modelling of VLF Trimpis using both finite element and 3D Born Modelling

Author(s) -

Baba K.,

Nunn D.,

Hayakawa M.

Publication year - 1998

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/1998gl900007

Subject(s) - scattering , finite element method , born approximation , physics , computational physics , perturbation (astronomy) , radius , limit (mathematics) , perturbation theory (quantum mechanics) , mathematical analysis , statistical physics , mathematics , optics , quantum mechanics , computer science , computer security , thermodynamics

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 valid in the non‐Born limit. The second is a 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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