Full-scale simulation study of stimulated electromagnetic emissions: The first ten milliseconds

Eliasson, Bengt; Stenflo, L.

doi:10.1017/s0022377809990559

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…We develop a numerical model for the resonant interaction and acceleration of electrons by SLT near the turning point z O of the O mode pump wave, where the pump frequency f 0 matches the local electron plasma frequency f p . The turbulence is simulated by means of a full wave model [ Eliasson , 2008a, 2008b; Eliasson and Stenflo , 2008, 2010]. The simulation code uses a one‐dimensional geometry, along the z ‐axis, starting at an altitude of 142 km and ending at 342 km.…”

Section: Modeling Hf‐excited Slt and Electron Accelerationmentioning

confidence: 99%

“…The simulation code uses a one‐dimensional geometry, along the z ‐axis, starting at an altitude of 142 km and ending at 342 km. Our simulation code is based on a nonuniform nested grid method [ Eliasson , 2008a; Eliasson and Stenflo , 2010]. While the electromagnetic radiation field is represented on a fixed grid with grid size 4 m everywhere, the electrostatic field and particle dynamics are resolved with a much denser grid of grid size δz = 4 cm locally, at z = 229.5–231.5 km (and also at the topside, at z = 252.5–254.5 km), in order to resolve small‐scale structures and electrostatic turbulence at the critical layer.…”

Section: Modeling Hf‐excited Slt and Electron Accelerationmentioning

confidence: 99%

“…The generalized Zakharov model couples the EM and Langmuir waves to the low‐frequency ion acoustic wave, giving rise to parametric instabilities and SLT [e.g., Eliasson and Stenflo , 2010]. The model also includes ion and electron Landau damping.…”

Section: Modeling Hf‐excited Slt and Electron Accelerationmentioning

confidence: 99%

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Numerical modeling of artificial ionospheric layers driven by high‐power HF heating

Eliasson¹,

Shao²,

Milikh³

et al. 2012

J. Geophys. Res.

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[1] We present a multi-scale dynamic model for the creation and propagation of artificial plasma layers in the ionosphere observed during high-power high-frequency (HF) heating experiments at HAARP. Ordinary (O) mode electromagnetic (EM) waves excite parametric instabilities and strong Langmuir turbulence (SLT) near the reflection point. The coupling between high-frequency electromagnetic and Langmuir waves and low-frequency ion acoustic waves is numerically simulated using a generalized Zakharov equation. The acceleration of plasma electrons is described by a Fokker-Planck model with an effective diffusion coefficient constructed using the simulated Langmuir wave spectrum. The propagation of the accelerated electrons through the non-uniform ionosphere is simulated by a kinetic model accounting for elastic and inelastic collisions with neutrals. The resulting ionization of neutral gas increases the plasma density below the acceleration region, so that the pump wave is reflected at a lower altitude. This leads to a new turbulent layer at the lower altitude, resulting in a descending artificial ionized layer (DAIL), that moves from near 230 km to about 150 km. At the terminal altitude, ionization, recombination, and ambipolar diffusion reach equilibrium, so the descent stops. The modeling results reproduce artificial ionospheric layers produced for similar sets of parameters during the high-power HF experiments at HAARP.Citation: Eliasson, B., X. Shao, G. Milikh, E. V. Mishin, and K. Papadopoulos (2012), Numerical modeling of artificial ionospheric layers driven by high-power HF heating,

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Section: Modeling Hf‐excited Slt and Electron Accelerationmentioning

confidence: 99%

Section: Modeling Hf‐excited Slt and Electron Accelerationmentioning

confidence: 99%

See 1 more Smart Citation

Numerical modeling of artificial ionospheric layers driven by high‐power HF heating

Eliasson¹,

Shao²,

Milikh³

et al. 2012

J. Geophys. Res.

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“…The results of the nighttime experiment show that the ionosphere was lifted by 30 to 50 km through continuously upward expansion. In the future work, a numerical simulation effort, similar to that [ Eliasson and Stenflo , 2010] for the phenomena explored in the overdense heating case, is also called for.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric modification from under-dense heating by high-power HF transmitter

et al. 2011

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[1] Under-dense HF heating experiments were conducted near local solar noon as well as in the nighttime with the HF heater transmitting at 9.1 MHz directed along the geomagnetic zenith and run at 2 min on and 2 min off. The effective isotropic radiated power of the HF transmitter exceeded 3 GW. The Digisonde operated in a fast mode was used to monitor the temporal evolution of the ionospheric electron density distributions in the bottomside of the ionosphere (in the ranges from 90 to 190 km in the noontime and from 230 to 350 km in the nighttime). The electron temperature distributions were then evaluated. The results show that the electron density distributions are modified continuously over the experimental periods. In the noontime, the electron density decreases/increases in time in the region below/above a height at about 140 km, manifesting the change of the balance between the photoionization and the electron-ion recombination and the electron-oxygen dissociative attachment losses by the heating. In the nighttime, the ionosphere was lifted by 30 to 50 km through continuously upward expansion, resulting in the drop of the electron density in the bottomside of the ionosphere in time. A comparison with the ionogram, height, and electron density distribution of unheated ionosphere with similar background conditions further elaborates the observation of thermal expansion.

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A 2D Numerical Study of the Langmuir Parametric Instability in the Ionospheric Modification

Tian

Liu

Zhou

2018

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)

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Full-scale simulation study of stimulated electromagnetic emissions: The first ten milliseconds

Cited by 7 publications

References 19 publications

Numerical modeling of artificial ionospheric layers driven by high‐power HF heating

Numerical modeling of artificial ionospheric layers driven by high‐power HF heating

Ionospheric modification from under-dense heating by high-power HF transmitter

A 2D Numerical Study of the Langmuir Parametric Instability in the Ionospheric Modification

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