Second harmonic electromagnetic emission via beam-driven Langmuir waves

Li, B.; Willes, A. J.; Robinson, P. A.; Cairns, Iver H.

doi:10.1063/1.1812274

Cited by 42 publications

(96 citation statements)

References 35 publications

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“…These emission mechanisms have been found to play an important role in different space phenomena such as type III solar radio bursts [1,2,3,4,5] and radiations of planet's magnetospheres [6,7]. Plasma emissions at ω p and 2ω p have been also observed in laboratory beam-plasma experiments [8,9,10,11].…”

Section: Introductionmentioning

confidence: 73%

Generation of powerful terahertz emission in a beam-driven strong plasma turbulence

Аржанников

Тимофеев

2012

Plasma Phys. Control. Fusion

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Abstract.Generation of terahertz electromagnetic radiation due to coalescence of upperhybrid waves in the long-wavelength region of strong plasma turbulence driven by a high-current relativistic electron beam in a magnetized plasma is investigated. The width of frequency spectrum as well as angular characteristics of this radiation for various values of plasma density and turbulence energy are calculated using the simple theoretical model adequately describing beam-plasma experiments at mirror traps. It is shown that the power density of electromagnetic emission at the second harmonic of plasma frequency in the terahertz range for these laboratory experiments can reach the level of 1 MW/cm 3 with 1% conversion efficiency of beam energy losses to electromagnetic emission.

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Section: Introductionmentioning

confidence: 73%

Generation of powerful terahertz emission in a beam-driven strong plasma turbulence

Аржанников

Тимофеев

2012

Plasma Phys. Control. Fusion

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“…͑5͒ The quasilinear interactions ͑i͒ are assumed to occur in one spatial dimension ͑1D͒, and the 3D ES decay and EM emission processes ͑ii͒-͑iv͒ are assumed to be axisymmetric along the direction of beam propagation, as in our earlier work for a homogeneous plasma. 49,50 ͑6͒ The generation and propagation of the EM waves are treated via projection of the processes ͑iv͒ and ͑v͒ to the beam direction. The approaches developed for Langmuir wave scattering off random density variations, 46 and for projecting the 3D ES decay process into 1D, 49 are utilized here.…”

Section: Introductionmentioning

confidence: 99%

“…49,50 ͑6͒ The generation and propagation of the EM waves are treated via projection of the processes ͑iv͒ and ͑v͒ to the beam direction. The approaches developed for Langmuir wave scattering off random density variations, 46 and for projecting the 3D ES decay process into 1D, 49 are utilized here. The coupled kinetic equations for electrons, Langmuir and ion-sound waves, and fundamental and second harmonic transverse waves are solved in time, position, speed, and wave number.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of type III solar radio bursts in the inhomogeneous solar corona and interplanetary medium

Robinson

Cairns

2006

Physics of Plasmas

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The first numerical calculations are presented for type III solar radio bursts in the inhomogeneous solar corona and interplanetary medium that include microscale quasilinear and nonlinear processes, intermediate-scale driven ambient density fluctuations, and large-scale evolution of electron beams, Langmuir and ion-sound waves, and fundamental and harmonic electromagnetic emission. Bidirectional coronal radiation driven by oppositely directed beams is asymmetric between the upward and downward directions due to downward beam narrowing in velocity space, and harmonic emission dominates fundamental emission, consistent with observations and theoretical analysis. In the interplanetary medium, fundamental and/or harmonic emission can be important depending on beam parameters and plasma conditions. Furthermore, Langmuir waves are bursty, ion-sound waves also show some degree of irregularity, while electromagnetic radiations are relatively smooth, all qualitatively consistent with observations. Moreover, the statistics of Langmuir wave energy agree well with the predictions of stochastic growth theory, indicating that the beam-Langmuir wave system evolves to a stochastic growth state.

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“…Within the source, beam and ES wave dynamics are simulated in a 1-D box along the axis of the conical frustum, due to computational limitations [Li et al, 2002[Li et al, , 2003. However, EM radiation is simulated in three dimensions [Li et al, 2005a[Li et al, , 2005b. The box has length l, with its end a distance d from the Sun.…”

Section: Overview Of the Simulation Modelmentioning

confidence: 99%

Simulations of coronal type III solar radio bursts: 2. Dynamic spectrum for typical parameters

Cairns

Robinson

2008

J. Geophys. Res.

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[1] Predictions are presented for the dynamic spectrum of a coronal type III burst observed at Earth, using a newly developed simulation model and employing realistic electron release and coronal parameters. The spectrum is studied in detail in association with the dynamics of beam and waves in the source. The frequency drift rate, radio flux, brightness temperature, and temporal profile of the type III burst agree semiquantitatively with typical observations. The simulation model is thus viable. Because of strong freefree absorption and scattering-induced damping, the flux of f p emission is significantly lower than that of 2f p emission and is below the lower thresholds of typical radio instruments. Moreover, the f p emission terminates at frequencies higher than the minimum simulated, and the 2f p emission appears to terminate at higher coronal altitudes that are not simulated because of computational limitations. Further simulations indicate that F-H pairs may exist under favorable conditions (e.g., generally, lower levels and larger length scales of the density fluctuations).Citation: Li, B., I. H. Cairns, and P. A. Robinson (2008), Simulations of coronal type III solar radio bursts: 2. Dynamic spectrum for typical parameters,

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Second harmonic electromagnetic emission via beam-driven Langmuir waves

Cited by 42 publications

References 35 publications

Generation of powerful terahertz emission in a beam-driven strong plasma turbulence

Generation of powerful terahertz emission in a beam-driven strong plasma turbulence

Numerical modeling of type III solar radio bursts in the inhomogeneous solar corona and interplanetary medium

Simulations of coronal type III solar radio bursts: 2. Dynamic spectrum for typical parameters

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