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Imaging the Three-Dimensional Ionospheric Structure with a Blob Basis Functional Ionospheric Tomography Model.

Debao Wen1, Dengkui Mei2, Yanan Du1

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A novel ionospheric tomography model using blob basis functions offers improved electron density reconstruction compared to traditional voxel models. This new method enhances accuracy and efficiency for analyzing the ionosphere using satellite observations.

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Area of Science:

  • Geophysics
  • Space Physics
  • Atmospheric Science

Background:

  • Ionospheric tomography is crucial for understanding the Earth's upper atmosphere.
  • Traditional models using voxel basis functions have limitations in accuracy and resolution.
  • Accurate mapping of ionospheric electron density is vital for various applications, including satellite navigation.

Purpose of the Study:

  • To introduce and validate a new ionospheric tomography model utilizing blob basis functions.
  • To enhance the accuracy and efficiency of reconstructing the spatio-temporal distribution of ionospheric electron density.
  • To compare the performance of the new model against traditional voxel-based methods.

Main Methods:

  • Developed a new ionospheric tomography model replacing voxel basis functions with overlapping, rotationally symmetric blob basis functions.
  • Implemented a numerical simulation scheme to assess model feasibility and compare reconstruction quality.
  • Incorporated variable blob radius to optimize computational efficiency.
  • Applied the model to reconstruct ionospheric electron density using Global Navigation Satellite System (GNSS) data.

Main Results:

  • Numerical simulations showed higher reconstruction quality with the blob basis function model compared to the voxel basis model.
  • The use of variable blob radius improved the model's efficiency.
  • Reconstructed spatio-temporal electron density profiles using real GNSS observations.
  • Comparisons with ionosonde data confirmed the model's reliability and superior performance.

Conclusions:

  • The proposed blob basis function ionospheric tomography model offers a significant advancement over traditional voxel-based methods.
  • The model demonstrates high reliability and superior accuracy in reconstructing ionospheric electron density.
  • This new approach provides a more effective tool for studying the dynamic ionosphere using GNSS data.