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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.