University of Illinois Urbana-Champaign

Incoherent scatter modeling of Jicamarca radar spectra

Aggarwal, Deepanshu

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Deepanshu_Aggarwal.pdf

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https://hdl.handle.net/2142/46790

Description

Title
Incoherent scatter modeling of Jicamarca radar spectra
Author(s)
Aggarwal, Deepanshu
Issue Date
2014-01-16T18:02:36Z
Director of Research (if dissertation) or Advisor (if thesis)
Kudeki, Erhan
Department of Study
Electrical and Computer Engineering
Discipline
Electrical & Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2014-01-16T18:02:36Z
Keyword(s)
  • Jicamarca
  • Radar spectra
  • k-Nearest Neighbors (KNN) Machine Learning
  • Ionosphere
  • Collision Frequency
  • Machine Learning
  • Electron ion collision
Abstract
This thesis describes a project on the modeling of spectral characteristics of electron density irregularities of the topside equatorial ionosphere probed by the Jicamarca Incoherent Scatter Radar (ISR) located near Lima, Peru. The topside equatorial ionosphere is a multi-ion plasma and the spectrum of its electron density irregularities can be modeled by extending the single-ion spectral model developed by Kudeki and Milla (2011) for a collisional equatorial F-region ionosphere. This single-ion model of Kudeki and Milla captures the essential physics of the equatorial F-region ionosphere where random displacements of the dominant oxygen ions are characterized as a Brownian-motion process, while electron displacements are non-Brownian and described in terms of a numerical library (constructed using a Monte-Carlo approach) of single-electron ACFs (autocorrelation functions) parametrized by five state parameters of the F-region consisting of ionospheric electron density, geomagnetic flux density, electron and ion temperatures, and the deviation angle of the radar boresight direction from the plane perpendicular to the geomagnetic field, the so-called magnetic aspect angle. While the extension of the model to the multi-ion case is straightforward, the discrete nature of the numerical electron ACF library defined over a grid of input parameters precludes the evaluation of the extended model with arbitrary and continuously varying input parameters. To overcome this difficulty a machine learning (ML) based interpolation procedure is developed. The thesis describes the ML algorithm, the associated training and testing steps, and finally presents a suite of examples of multi-ion IS spectra obtained with the extended model.
Graduation Semester
2013-12
Permalink
http://hdl.handle.net/2142/46790
Copyright and License Information
Copyright 2013 Deepanshu Aggarwal

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