Monitoring the three-dimensional ionospheric electron density distribution using GPS observations over China |
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| Authors: | Debao Wen Yunbin Yuan Jikun Ou |
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| Institution: | (1) Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 340 Xudong Road, Wuhan, 430 077, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100 039, China |
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| Abstract: | In this paper, an IRI model assisted GPS-based Computerized Ionospheric Tomography (CIT) technique is developed to inverse
the ionospheric electron density (IED) distribution over China. Essentially, an improved algebraic reconstruction technique
(IART) is first proposed to reconstruct the ionospheric images with high resolution and high efficiency. A numerical experiment
is used to validate the reliability of the method and its advantages to the classical algebraic reconstruction technique (ART).
This is then used to reconstruct the IED images using the GPS data in China. The variations of the IED during magnetically
quiet and disturbed days are reported and analyzed here. Reconstructed results during magnetically quiet days show some prominent
ionospheric features such as the development of equatorial anomaly and the tilt of ionization crest. Meanwhile, ionospheric
storm phase effects and disturbed features can also be revealed from the reconstructed IED image under storm conditions. Research
shows that the positive storm phase effects usually happen in southern China, and the negative storm phase effects mainly
occur in northern China. The equatorial anomaly crest moved to the north in the main phase of the storm. Ionosonde data recorded
at Wuhan station provides the verification for the reliability of GPS-based CIT technique. |
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| Keywords: | Atmospheric sciences geophysics remote sensing GPS computerized ionospheric tomography (CIT) ionospheric electron density total electron content (TEC) ionosonde equatorial anomaly |
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