Double-thin-shell approach to deriving total electron content from GNSS signals and implications for ionospheric dynamics near the magnetic equator

Author:

Maruyama TakashiORCID,Hozumi Kornyanat,Ma Guanyi,Supnithi Pornchai,Tongkasem Napat,Wan Qingtao

Abstract

AbstractA new technique was developed to estimate the ionospheric total electron content (TEC) from Global Navigation Satellite System (GNSS) satellite signals. The vertically distributed electron density was parameterized by two thin-shell layers (double-shell approach). The spatiotemporal variation of TEC (strictly speaking, partial electron content) associated with each shell was approximated by the functional fitting of spherical surface harmonics. The major improvements over the conventional single-shell approach were as follows: (1) the precise estimation of TEC was achieved; (2) the estimated TEC was less dependent on the choice of shell heights; and (3) the equatorial anomaly was captured more correctly. Furthermore, higher and lower shells exhibited a different pattern of local time vs latitude variation, providing information on the ionosphere–thermosphere dynamics.

Funder

National Natural Science Foundation of China

National Key Research Program of China

Japan Society for the Promotion of Science

King Mongkut’s Institute of Technology Ladkrabang

Publisher

Springer Science and Business Media LLC

Subject

Space and Planetary Science,Geology

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