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  • 10 - Data Assimilation in the Near-Earth Electron Radiation Environment

  • from Part II - ‘Fluid’ Earth Applications: From the Surface to the Space
  • Edited by Alik Ismail-Zadeh, Karlsruhe Institute of Technology, Germany, Fabio Castelli, Università degli Studi, Florence, Dylan Jones, University of Toronto, Sabrina Sanchez, Max Planck Institute for Solar System Research, Germany
  • Book:
    Applications of Data Assimilation and Inverse Problems in the Earth Sciences
    Published online:
    20 June 2023
    Print publication:
    06 July 2023, pp 157-172

  • Summary

    Abstract: Energetic charged particles trapped by the Earth’s magnetic field present a significant hazard for Earth-orbiting satellites and humans in space. Application of the data assimilation tools allows us to reconstruct the global state of the radiation particle environment from sparse single-point observations. The measurements from different satellites with different observational errors can be blended in an optimal way with physics-based models. The mathematical formulation on the diffusion and diffusion-advection equations for the Earth’s Van Allen radiation belts and ring current is described. We further describe several recent studies that successfully applied the data assimilation tools to the near-Earth space radiation environment. The applications to the reanalysis of the radiation belts and ring current, real-time predictions, and analysis of the missing physical processes are described and motivation for these studies is provided. We further discuss various assimilation techniques and potential topics for future research.