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Modeling of Finite Polar Cap Ionospheric Patches: Initialization From Data and F‐Region Evolution.

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Title: Modeling of Finite Polar Cap Ionospheric Patches: Initialization From Data and F‐Region Evolution.
Authors: Redden, Mark1 (AUTHOR) reddenm@my.erau.edu, Lamarche, Leslie2 (AUTHOR), Zettergren, Matthew1 (AUTHOR) zettergm@erau.edu
Source: Journal of Geophysical Research. Space Physics. Dec2025, Vol. 130 Issue 12, p1-25. 25p.
Subject Terms: Ionospheric plasma, Electron density, Geophysical observations, Ionospheric disturbances, Incoherent scattering, Computer simulation, Prediction models, Polarization (Electricity)
Abstract: Computer simulations of polar cap ionospheric plasma patches have been used to supplement decades of theoretical and observational work. The validity of simulation results—their ability to accurately mimic polar cap ionospheric dynamics—relies, in some part, on the degree to which the model initial conditions properly replicate polar cap ionosphere configurations at the stage of instability of interest. In this study a specific method is developed to integrate incoherent scatter radar data into a format that can easily be incorporated into numerical models, improving polar cap patch characterization accuracy throughout a simulation with the use of an observational set of plasma parameters, as opposed to the use of a simplified, notional plasma patch characterization. Analysis of modeled plasma volumes focuses on characterizations of mesoscale structuring of the patch over time, as demonstrated by distributions of electron and relative charge densities, maximum linear instability growth rates, and electron density gradient scale length distributions. Results emphasize several significant aspects of the growth of mesoscale structures over the 60 min duration of the simulations, including (a) the tendency for flow‐ and energy‐dependent F‐region chemistry to impact growth via increased chemical recombination, and (b) the role of the finite patch extent in modulating polarization electric field responses, background evolution, and impacts on structure growth. Key Points: We develop and implement a specific method to integrate incoherent scatter radar data into an ionospheric numerical modelMesoscale analysis of modeled finite extent polar cap patches characterized by observational data is conductedWe highlight the relevance of gradient scale length distributions, flow‐dependent chemistry and polarization E‐fields in patch structuring [ABSTRACT FROM AUTHOR]
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Abstract:Computer simulations of polar cap ionospheric plasma patches have been used to supplement decades of theoretical and observational work. The validity of simulation results—their ability to accurately mimic polar cap ionospheric dynamics—relies, in some part, on the degree to which the model initial conditions properly replicate polar cap ionosphere configurations at the stage of instability of interest. In this study a specific method is developed to integrate incoherent scatter radar data into a format that can easily be incorporated into numerical models, improving polar cap patch characterization accuracy throughout a simulation with the use of an observational set of plasma parameters, as opposed to the use of a simplified, notional plasma patch characterization. Analysis of modeled plasma volumes focuses on characterizations of mesoscale structuring of the patch over time, as demonstrated by distributions of electron and relative charge densities, maximum linear instability growth rates, and electron density gradient scale length distributions. Results emphasize several significant aspects of the growth of mesoscale structures over the 60 min duration of the simulations, including (a) the tendency for flow‐ and energy‐dependent F‐region chemistry to impact growth via increased chemical recombination, and (b) the role of the finite patch extent in modulating polarization electric field responses, background evolution, and impacts on structure growth. Key Points: We develop and implement a specific method to integrate incoherent scatter radar data into an ionospheric numerical modelMesoscale analysis of modeled finite extent polar cap patches characterized by observational data is conductedWe highlight the relevance of gradient scale length distributions, flow‐dependent chemistry and polarization E‐fields in patch structuring [ABSTRACT FROM AUTHOR]
ISSN:21699380
DOI:10.1029/2025JA034479