Ionospheric structure in the region of East-Asian equatorial anomaly reconstructed by tomography |
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| Authors: | Xu Jisheng Ma Shuying Yang Qihan K. C. Yeh C. H. Liu J. S. Franke |
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| Affiliation: | (1) College of Electronic Information, Wuhan University, 430072 Wuhan, China;(2) Department of ECE, University of Illinois, 61801 Urbana-Champaign, IL, USA;(3) Institute of Space Science, Central University, Chungli, Taiwan, China |
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| Abstract: | A chain of low latitudinal ionospheric tomography along 120°E meridian has been operating since 1993. This chain is composed of six stations from Shanghai to Manila receiving signals from the transit NNSS satellites. In this paper several reconstruction examples are presented, which give the 2-D imaging of electron density distribution obtained from the observed TEC data by means of computerized tomography technique. In reconstruction process a multi-station method was used to determine the unknown phase offset. To overcome the limitation of incomplete projection data, a technique of backprojection in combination with a normalized ionospheric model was introduced to obtain the initial guess of electron density distribution. The results demonstrate that ionospheric tomographic technology is very useful and effective to investigate the equatorial and low-latitudinal ionospheric structures and dynamics. Supported by the National Natural Science Foundation, of China & the Science Fourdation of State Education Committee of China Xu Jisheng: born in Nov. 1946, Professor |
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| Keywords: | computerized tomography ionosphere equatorial anomaly |
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