Open AccessTomography Reconstruction of Ionospheric Electron Density with Empirical Orthonormal Functions Using Korea GNSS Network
Author(s) -
J. Hong,
Yong Ha Kim,
JongKyun Chung,
Nicholas Ssessanga,
YoungSil Kwak
Publication year - 2017
Publication title -
journal of astronomy and space sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.273
H-Index - 11
eISSN - 2093-5587
pISSN - 2093-1409
DOI - 10.5140/jass.2017.34.1.7
Subject(s) - tec , total electron content , ionosphere , international reference ionosphere , gnss applications , algebraic reconstruction technique , empirical orthogonal functions , global positioning system , geodesy , remote sensing , orthonormal basis , computer science , algorithm , meteorology , geology , geography , physics , geophysics , telecommunications , iterative reconstruction , climatology , quantum mechanics , artificial intelligence
In South Korea, there are about 80 Global Positioning System (GPS) monitoring stations providing total electron content\ud(TEC) every 10 min, which can be accessed through Korea Astronomy and Space Science Institute (KASI) for scientific\uduse. We applied the computerized ionospheric tomography (CIT) algorithm to the TEC dataset from this GPS network\udfor monitoring the regional ionosphere over South Korea. The algorithm utilizes multiplicative algebraic reconstruction\udtechnique (MART) with an initial condition of the latest International Reference Ionosphere-2016 model (IRI-2016). In\udorder to reduce the number of unknown variables, the vertical profiles of electron density are expressed with a linear\udcombination of empirical orthonormal functions (EOFs) that were derived from the IRI empirical profiles. Although\udthe number of receiver sites is much smaller than that of Japan, the CIT algorithm yielded reasonable structure of the\udionosphere over South Korea. We verified the CIT results with NmF2 from ionosondes in Icheon and Jeju and also with GPS\udTEC at the center of South Korea. In addition, the total time required for CIT calculation was only about 5 min, enabling the\udexploration of the vertical ionospheric structure in near real time