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Reconstructing regional ionospheric electron density: a combined spherical slepian function and empirical orthogonal function approach

Farzaneh, Saeed and Forootan, Ehsan 2018. Reconstructing regional ionospheric electron density: a combined spherical slepian function and empirical orthogonal function approach. Surveys in Geophysics 39 (2) , pp. 289-309. 10.1007/s10712-017-9446-y

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Abstract

The computerized ionospheric tomography is a method for imaging the Earth’s ionosphere using a sounding technique and computing the slant total electron content (STEC) values from data of the global positioning system (GPS). The most common approach for ionospheric tomography is the voxel-based model, in which (1) the ionosphere is divided into voxels, (2) the STEC is then measured along (many) satellite signal paths, and finally (3) an inversion procedure is applied to reconstruct the electron density distribution of the ionosphere. In this study, a computationally efficient approach is introduced, which improves the inversion procedure of step 3. Our proposed method combines the empirical orthogonal function and the spherical Slepian base functions to describe the vertical and horizontal distribution of electron density, respectively. Thus, it can be applied on regional and global case studies. Numerical application is demonstrated using the ground-based GPS data over South America. Our results are validated against ionospheric tomography obtained from the constellation observing system for meteorology, ionosphere, and climate (COSMIC) observations and the global ionosphere map estimated by international centers, as well as by comparison with STEC derived from independent GPS stations. Using the proposed approach, we find that while using 30 GPS measurements in South America, one can achieve comparable accuracy with those from COSMIC data within the reported accuracy (1 × 1011 el/cm3) of the product. Comparisons with real observations of two GPS stations indicate an absolute difference is less than 2 TECU (where 1 total electron content unit, TECU, is 1016 electrons/m2).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Springer Verlag
ISSN: 0169-3298
Date of First Compliant Deposit: 8 November 2017
Date of Acceptance: 29 October 2017
Last Modified: 17 Oct 2019 15:00
URI: http://orca.cf.ac.uk/id/eprint/106338

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