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GPS ionospheric tomography: A comparison with the IRI-2001 model over South Korea

Abstract

The International Reference Ionosphere model 2001 (IRI-2001) is one of the most comprehensive empirical models of the ionosphere and has been widely used to estimate the electron density profiles in the altitude ranging from about 60 to 2000 km and the total electron content (TEC) at any given location, time and date, which reflect smooth-average global ionospheric behaviors. However, whether it provides normal actual estimations in the ionosphere over some regions should be tested with real observation data. In this paper, the three-dimensional ionospheric electron density profiles over South Korea in 2003 are obtained using the ionospheric tomography reconstruction technique with the permanent Korean GPS Network (KGN) data, and its validity is further verified by another independent ionosonde data. The GPS ionospheric reconstruction results are used to compare then results obtained with the IRI-2001 model in South Korea in terms of NmF2 and TEC. The monthly averaged diurnal values of these key parameters in January, April, July and October 2003 are considered to represent the winter, spring, summer and autumn seasons, respectively. Compared with the GPS reconstruction results, averaged monthly NmF2 medians from the IRI-2001 are overestimated in daytime and underestimated in nighttime for all seasons, but the deviation magnitudes in autumn and winter are smaller than in spring and summer. In addition, averaged monthly TEC medians from the IRI-2001 are overestimated in daytime in winter, but almost always underestimated in other seasons.

References

  • Afraimovich, E., E. A. Kosogorov, and L. A. Leonovich, Determining parameters of large scale traveling ionospheric disturbances of auroral origin using GPS arrays, J. Atmos. Sol. Terr. Phys., 62, 553–565, 2000.

    Article  Google Scholar 

  • Bilitza, D., International Reference Ionosphere 2000, Radio Sci., 36, 261–275, 2001.

    Article  Google Scholar 

  • Ezquer, R. G., C. A. Jadur, and M. Mostert, IRI-95 TEC predictions for the South American peak of the equatorial anomaly, Adv. Space Res., 22, 811–814, 1998.

    Article  Google Scholar 

  • Gordon, R., R. Bender, and G. Therman, Algebraic Reconstruction Techniques (ART) for three Dimensional Electron Micoscopy and X-ray Photography, J. Theor. Biol., 29, 471–481, 1970.

    Article  Google Scholar 

  • Heki, K. and J. S. Ping, Directivity and apparent velocity of the coseismic ionospheric disturbances observed with a dense GPS array, Earth Planet. Sci. Lett., 236, 845–855, 2005.

    Article  Google Scholar 

  • Jakowski, N., A. Wehrenpfennig, S. Heise, C. Reigber, H. Lühr, L. Grunwaldt, and T. Meehan, GPS radio occultation measurements of the ionosphere from CHAMP: Early results, Geophys. Res. Lett., 29, 951–954, 2002.

    Article  Google Scholar 

  • Jin, S. G., J. Wang, H. P. Zhang, and W. Y. Zhu, Real-time monitoring and prediction of Ionosphere Electron Content by means of GPS, Chinese Astron. Astrophys., 28, 331–337, 2004.

    Article  Google Scholar 

  • Jin, S. G., J. U. Park, J. Wang, B. K. Choi, and P. H. Park, Electron density profiles derived from ground-based GPS observations, J. Navigation, 59(3), 395–401, 2006a.

    Article  Google Scholar 

  • Jin, S. G. and P. H. Park, Strain accumulation in South Korea inferred from GPS measurements, Earth Planets Space, 58(5), 529–534, 2006b.

    Article  Google Scholar 

  • Klobuchar, J. K., Ionospheric effects on GPS, GPS World, 48–51, 1991.

    Google Scholar 

  • Otsuka, Y., T. Ogawa, A. Saito, T. Tsugawa, S. Fukao, and S. Miyazak, A new technique for mapping of total electron content using GPS network in Japan, Earth Planets Space, 54, 63–70, 2002.

    Article  Google Scholar 

  • Raymund, T. D., J. R. Austen, and S. J. Franke, Application of computerized tomography to the investigation of ionospheric structures, Radio Sci., 25, 771–789, 1990.

    Article  Google Scholar 

  • Reinishch, B. W., D. M. Haines, R. F. Benson, J. L. Green, G. S. Sales, and W. Taylor, Radio sounding in space: Magnetosphere and topside ionosphere, J. Atmos. Sol. Terr. Phys., 63, 87–98, 2001.

    Article  Google Scholar 

  • Tsunoda, R. T., High-latitude F-region irregularities: a review and synthesis, Rev. Geophys., 26, 719–760, 1988.

    Article  Google Scholar 

  • Yamamoto, A., Y. Ohta, T. Okuzawa, S. Taguchi, I. Tomizawa, and T. Shibata, Characteristics of TEC variations observed at Chofu for geomagnetic storms, Earth Planets Space, 52, 1073–1076, 2000.

    Article  Google Scholar 

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Correspondence to Shuanggen Jin.

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Jin, S., Park, JU. GPS ionospheric tomography: A comparison with the IRI-2001 model over South Korea. Earth Planet Sp 59, 287–292 (2007). https://doi.org/10.1186/BF03353106

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  • DOI: https://doi.org/10.1186/BF03353106

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