Geometric dependence of electric field swelling in simulation of HF ionospheric heating

Blagoje Djordjevic, Xi Shao, Gennady Milikh, Bengt Eliasson, Dennis K. Papadopoulos

Research output: Contribution to conferencePoster

Abstract

The interaction between a high frequency (HF) ordinary mode electromagnetic wave and the ionosphere induces electrostatic turbulence near the critical layer which results in the acceleration of electrons and ionization of the neutral gas by energetic electrons. Due to the artificial plasma created by this process, the reflection point of the electromagnetic wave is shifted downwards, leading to descending artificial ionospheric layers (DAILs). This work studies the dependence of DAIL formation on the injection angle of the HF wave and on the related ionospheric conditions. The model is based on a combination of ray-tracing techniques and numerical solutions of the Försterling equations. A model based on the Försterling equations has been developed to calculate the enhancement (swelling) of the electric field near the reflection point. As the swelling exceeds a certain threshold, it excites Langmuir turbulence, which in turn accelerates electrons to high energies, resulting in DAIL formation. Previous full-wave simulations of ionospheric turbulence have been able to capture some of the 2D nature of ionospheric heating but at great computational cost. This works presents an approach to performing rapid calculations of the electric field swelling of the ordinary mode, in order to facilitate a more computationally efficient 2D study of DAIL formation. Results show maximum swelling of the electric field near the magnetic zenith, with an amplitude on the order of several tens of volts per meter for a pump voltage of 1-2 V/m, which is in agreement with previous computational models as well as experiment. Preliminary work to incorporate a model for Langmuir turbulence induced by electric field swelling into the overall algorithm is also presented.

Conference

ConferenceAGU Fall Meeting
CountryUnited States
CitySan Francisco
Period15/12/1419/12/14

Fingerprint

ionospheric heating
swelling
ionospherics
electric fields
Langmuir turbulence
simulation
electromagnetic radiation
turbulence
electrons
neutral gases
zenith
ray tracing
ionospheres
electrostatics
pumps
injection
costs
ionization
thresholds
augmentation

Keywords

  • electrostatic turbulence
  • ionization
  • electric field swelling
  • ionospheric conditions

Cite this

Djordjevic, B., Shao, X., Milikh, G., Eliasson, B., & Papadopoulos, D. K. (2014). Geometric dependence of electric field swelling in simulation of HF ionospheric heating. Poster session presented at AGU Fall Meeting, San Francisco, United States.
Djordjevic, Blagoje ; Shao, Xi ; Milikh, Gennady ; Eliasson, Bengt ; Papadopoulos, Dennis K. / Geometric dependence of electric field swelling in simulation of HF ionospheric heating. Poster session presented at AGU Fall Meeting, San Francisco, United States.
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abstract = "The interaction between a high frequency (HF) ordinary mode electromagnetic wave and the ionosphere induces electrostatic turbulence near the critical layer which results in the acceleration of electrons and ionization of the neutral gas by energetic electrons. Due to the artificial plasma created by this process, the reflection point of the electromagnetic wave is shifted downwards, leading to descending artificial ionospheric layers (DAILs). This work studies the dependence of DAIL formation on the injection angle of the HF wave and on the related ionospheric conditions. The model is based on a combination of ray-tracing techniques and numerical solutions of the F{\"o}rsterling equations. A model based on the F{\"o}rsterling equations has been developed to calculate the enhancement (swelling) of the electric field near the reflection point. As the swelling exceeds a certain threshold, it excites Langmuir turbulence, which in turn accelerates electrons to high energies, resulting in DAIL formation. Previous full-wave simulations of ionospheric turbulence have been able to capture some of the 2D nature of ionospheric heating but at great computational cost. This works presents an approach to performing rapid calculations of the electric field swelling of the ordinary mode, in order to facilitate a more computationally efficient 2D study of DAIL formation. Results show maximum swelling of the electric field near the magnetic zenith, with an amplitude on the order of several tens of volts per meter for a pump voltage of 1-2 V/m, which is in agreement with previous computational models as well as experiment. Preliminary work to incorporate a model for Langmuir turbulence induced by electric field swelling into the overall algorithm is also presented.",
keywords = "electrostatic turbulence, ionization, electric field swelling, ionospheric conditions",
author = "Blagoje Djordjevic and Xi Shao and Gennady Milikh and Bengt Eliasson and Papadopoulos, {Dennis K.}",
year = "2014",
month = "12",
day = "19",
language = "English",
note = "AGU Fall Meeting ; Conference date: 15-12-2014 Through 19-12-2014",

}

Djordjevic, B, Shao, X, Milikh, G, Eliasson, B & Papadopoulos, DK 2014, 'Geometric dependence of electric field swelling in simulation of HF ionospheric heating' AGU Fall Meeting, San Francisco, United States, 15/12/14 - 19/12/14, .

Geometric dependence of electric field swelling in simulation of HF ionospheric heating. / Djordjevic, Blagoje; Shao, Xi; Milikh, Gennady; Eliasson, Bengt; Papadopoulos, Dennis K.

2014. Poster session presented at AGU Fall Meeting, San Francisco, United States.

Research output: Contribution to conferencePoster

TY - CONF

T1 - Geometric dependence of electric field swelling in simulation of HF ionospheric heating

AU - Djordjevic, Blagoje

AU - Shao, Xi

AU - Milikh, Gennady

AU - Eliasson, Bengt

AU - Papadopoulos, Dennis K.

PY - 2014/12/19

Y1 - 2014/12/19

N2 - The interaction between a high frequency (HF) ordinary mode electromagnetic wave and the ionosphere induces electrostatic turbulence near the critical layer which results in the acceleration of electrons and ionization of the neutral gas by energetic electrons. Due to the artificial plasma created by this process, the reflection point of the electromagnetic wave is shifted downwards, leading to descending artificial ionospheric layers (DAILs). This work studies the dependence of DAIL formation on the injection angle of the HF wave and on the related ionospheric conditions. The model is based on a combination of ray-tracing techniques and numerical solutions of the Försterling equations. A model based on the Försterling equations has been developed to calculate the enhancement (swelling) of the electric field near the reflection point. As the swelling exceeds a certain threshold, it excites Langmuir turbulence, which in turn accelerates electrons to high energies, resulting in DAIL formation. Previous full-wave simulations of ionospheric turbulence have been able to capture some of the 2D nature of ionospheric heating but at great computational cost. This works presents an approach to performing rapid calculations of the electric field swelling of the ordinary mode, in order to facilitate a more computationally efficient 2D study of DAIL formation. Results show maximum swelling of the electric field near the magnetic zenith, with an amplitude on the order of several tens of volts per meter for a pump voltage of 1-2 V/m, which is in agreement with previous computational models as well as experiment. Preliminary work to incorporate a model for Langmuir turbulence induced by electric field swelling into the overall algorithm is also presented.

AB - The interaction between a high frequency (HF) ordinary mode electromagnetic wave and the ionosphere induces electrostatic turbulence near the critical layer which results in the acceleration of electrons and ionization of the neutral gas by energetic electrons. Due to the artificial plasma created by this process, the reflection point of the electromagnetic wave is shifted downwards, leading to descending artificial ionospheric layers (DAILs). This work studies the dependence of DAIL formation on the injection angle of the HF wave and on the related ionospheric conditions. The model is based on a combination of ray-tracing techniques and numerical solutions of the Försterling equations. A model based on the Försterling equations has been developed to calculate the enhancement (swelling) of the electric field near the reflection point. As the swelling exceeds a certain threshold, it excites Langmuir turbulence, which in turn accelerates electrons to high energies, resulting in DAIL formation. Previous full-wave simulations of ionospheric turbulence have been able to capture some of the 2D nature of ionospheric heating but at great computational cost. This works presents an approach to performing rapid calculations of the electric field swelling of the ordinary mode, in order to facilitate a more computationally efficient 2D study of DAIL formation. Results show maximum swelling of the electric field near the magnetic zenith, with an amplitude on the order of several tens of volts per meter for a pump voltage of 1-2 V/m, which is in agreement with previous computational models as well as experiment. Preliminary work to incorporate a model for Langmuir turbulence induced by electric field swelling into the overall algorithm is also presented.

KW - electrostatic turbulence

KW - ionization

KW - electric field swelling

KW - ionospheric conditions

UR - https://agu.confex.com/agu/fm14/meetingapp.cgi#Paper/10803

UR - http://fallmeeting.agu.org/2014/

UR - http://sites.agu.org/

M3 - Poster

ER -

Djordjevic B, Shao X, Milikh G, Eliasson B, Papadopoulos DK. Geometric dependence of electric field swelling in simulation of HF ionospheric heating. 2014. Poster session presented at AGU Fall Meeting, San Francisco, United States.