Analysis of inversion errors of ionospheric radio occultation |
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Authors: | Xiaocheng Wu Xiong Hu Xiaoyan Gong Xunxie Zhang Xin Wang |
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Institution: | (1) Center for Space Science and Applied Research, Chinese Academy of Sciences, 100190 Beijing, China;(2) Graduate University of Chinese Academy of Sciences, 100049 Beijing, China;(3) Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071 Wuhan, China |
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Abstract: | The retrieved electron density profile of ionospheric radio occultation (RO) simulation data can be compared with the background
model value during the simulation and the inversion error can be obtained exactly. This paper studies the inversion error
of ionospheric RO through simulation. The sources of the inversion errors are analyzed. The impacts of measurement errors,
such as the errors in phase measurements and satellite orbits, are very small and can be neglected. The approximation of straight-line
propagation introduces errors at the height of the F1 layer under solar maximum condition. The spherical symmetry approximation
of the electron density distribution is found to be the main source of the inversion error. The statistical results reveal
some characteristics of the inversion errors. (1) The relative error increases with enhanced solar activity. (2) It is larger
in winter than in equinox season, and it is smallest in summer. (3) For all seasons, it is smaller at middle latitude than
at other latitudes. (4) For all seasons and geomagnetic latitudes, it is smaller at daytime than at other times. The NmF2
of the ROs from COSMIC are compared with the measurements of ionosondes, and the relative differences show the same dependencies
on season, geomagnetic latitude and local time, as the relative errors of the simulated ionospheric ROs.
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Keywords: | Ionospheric radio occultation Error source Simulation Asymmetry of electron density COSMIC |
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