Tomography Reconstruction of Ionospheric Electron Density with Empirical Orthonormal Functions Using Korea GNSS Network
In South Korea, there are about 80 Global Positioning System (GPS) monitoring stations providing total electron content (TEC) every 10 min, which can be accessed through Korea Astronomy and Space Science Institute (KASI) for scientific use. We applied the computerized ionospheric tomography (CIT)...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
Published: |
Korean Space Science Society (KSSS)
2017-03-01
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Series: | Journal of Astronomy and Space Sciences |
Subjects: | |
Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2017/v34n1/OJOOBS_2017_v34n1_7.pdf |
Summary: | In South Korea, there are about 80 Global Positioning System (GPS) monitoring stations providing total electron content
(TEC) every 10 min, which can be accessed through Korea Astronomy and Space Science Institute (KASI) for scientific
use. We applied the computerized ionospheric tomography (CIT) algorithm to the TEC dataset from this GPS network
for monitoring the regional ionosphere over South Korea. The algorithm utilizes multiplicative algebraic reconstruction
technique (MART) with an initial condition of the latest International Reference Ionosphere-2016 model (IRI-2016). In
order to reduce the number of unknown variables, the vertical profiles of electron density are expressed with a linear
combination of empirical orthonormal functions (EOFs) that were derived from the IRI empirical profiles. Although
the number of receiver sites is much smaller than that of Japan, the CIT algorithm yielded reasonable structure of the
ionosphere over South Korea. We verified the CIT results with NmF2 from ionosondes in Icheon and Jeju and also with GPS
TEC at the center of South Korea. In addition, the total time required for CIT calculation was only about 5 min, enabling the
exploration of the vertical ionospheric structure in near real time. |
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ISSN: | 2093-5587 2093-1409 |