Large-scale numerical simulation of ionospheric Langmuir turbulence excited by a radio frequency electromagnetic wave

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Abstract

A numerical simulation is presented concerning an L/O mode electromagnetic wave propagating normally into an overdense magnetized plasma with a smooth density gradient leading to excitation of Langmuir turbulence in the vicinity of the reflection point. The simulation parameters are chosen to represent an ionospheric radio frequency heating experiment but may have relevance to other situations. The simulation model is one-dimensional for large-scale electromagnetic waves and two-dimensional for short-scale electrostatic waves. This allows consideration of local modulational and parametric-decay instabilities as well as the larger scale depletion of the driver electromagnetic wave by anomalous absorption due to the excited turbulence. Simulated growth rates are shown to be in broad agreement with expected values and the evolution of the spatial distribution of the turbulence and driver field profile are presented along with simulated scatter radar spectra.
LanguageEnglish
Article number035013
Number of pages18
JournalPlasma Physics and Controlled Fusion
Volume61
Early online date5 Dec 2018
DOIs
Publication statusPublished - 7 Feb 2019

Fingerprint

Langmuir turbulence
Electromagnetic waves
ionospherics
radio frequencies
electromagnetic radiation
Turbulence
Computer simulation
ionospheric heating
turbulence
radio frequency heating
electrostatic waves
simulation
Spatial distribution
radar
Electrostatics
spatial distribution
depletion
Radar
Plasmas
Heating

Keywords

  • Langmuir turbulence
  • numerical simulation
  • multiscale

Cite this

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title = "Large-scale numerical simulation of ionospheric Langmuir turbulence excited by a radio frequency electromagnetic wave",
abstract = "A numerical simulation is presented concerning an L/O mode electromagnetic wave propagating normally into an overdense magnetized plasma with a smooth density gradient leading to excitation of Langmuir turbulence in the vicinity of the reflection point. The simulation parameters are chosen to represent an ionospheric radio frequency heating experiment but may have relevance to other situations. The simulation model is one-dimensional for large-scale electromagnetic waves and two-dimensional for short-scale electrostatic waves. This allows consideration of local modulational and parametric-decay instabilities as well as the larger scale depletion of the driver electromagnetic wave by anomalous absorption due to the excited turbulence. Simulated growth rates are shown to be in broad agreement with expected values and the evolution of the spatial distribution of the turbulence and driver field profile are presented along with simulated scatter radar spectra.",
keywords = "Langmuir turbulence, numerical simulation, multiscale",
author = "Heelis, {T J} and K Ronald and B Eliasson",
year = "2019",
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AU - Heelis, T J

AU - Ronald, K

AU - Eliasson, B

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N2 - A numerical simulation is presented concerning an L/O mode electromagnetic wave propagating normally into an overdense magnetized plasma with a smooth density gradient leading to excitation of Langmuir turbulence in the vicinity of the reflection point. The simulation parameters are chosen to represent an ionospheric radio frequency heating experiment but may have relevance to other situations. The simulation model is one-dimensional for large-scale electromagnetic waves and two-dimensional for short-scale electrostatic waves. This allows consideration of local modulational and parametric-decay instabilities as well as the larger scale depletion of the driver electromagnetic wave by anomalous absorption due to the excited turbulence. Simulated growth rates are shown to be in broad agreement with expected values and the evolution of the spatial distribution of the turbulence and driver field profile are presented along with simulated scatter radar spectra.

AB - A numerical simulation is presented concerning an L/O mode electromagnetic wave propagating normally into an overdense magnetized plasma with a smooth density gradient leading to excitation of Langmuir turbulence in the vicinity of the reflection point. The simulation parameters are chosen to represent an ionospheric radio frequency heating experiment but may have relevance to other situations. The simulation model is one-dimensional for large-scale electromagnetic waves and two-dimensional for short-scale electrostatic waves. This allows consideration of local modulational and parametric-decay instabilities as well as the larger scale depletion of the driver electromagnetic wave by anomalous absorption due to the excited turbulence. Simulated growth rates are shown to be in broad agreement with expected values and the evolution of the spatial distribution of the turbulence and driver field profile are presented along with simulated scatter radar spectra.

KW - Langmuir turbulence

KW - numerical simulation

KW - multiscale

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T2 - Plasma Physics and Controlled Fusion

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SN - 0741-3335

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