Evidence for wave coupling in type III emissions

Henri, Pierre; Briand, C.; Mangeney, A.; Bale, S. D.; Califano, Francesco; Goetz, K.; Kaiser, M. L.

doi:10.1029/2008ja013738

Cited by 64 publications

(102 citation statements)

References 48 publications

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“…According to the nonlinear conversion of Langmuir waves, type III radio emissions are expected to result from the decay of Langmuir waves. Evidence for electrostatic parametric decay were provided by Henri et al [2009]. Evidence of in situ observations of electrostatic parametric decay are also provided in this paper.…”

Section: Discussionmentioning

confidence: 66%

“…As the density decreases with the distance to the Sun, the plasma frequency decreases, and the type III exhibits their characteristic time-frequency drift. Several wave conversion processes have been discussed from linear mode conversion in inhomogeneous density profiles [Field, 1956;Kim et al, 2008;Schleyer et al, 2013] to nonlinear processes including nonlinear beam instability [Yoon, 1995], wave coupling (electrostatic parametric decay [Cairns, 1987b;Henri et al, 2009], or electromagnetic coupling [Cairns, 1987a]). …”

Section: Introductionmentioning

confidence: 99%

“…Recently, Henri et al [2009] have provided strong observational evidence in favor of the electrostatic parametric decay. This is a two-step process that yields to an electromagnetic wave at twice the plasma frequency.…”

Section: Introductionmentioning

confidence: 99%

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Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations

2014

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International audienceWe report the peculiar interaction of two type III bursts observed in the solar wind. As electronbeams propagating on the same magnetic field lines cross, a spectacular depletion of the type III radioemission is observed. We combine observations from the WAVES experiment on board the STEREO missiontogether with kinetic plasma simulations to study the extinction of type III radio emission resulting fromthe interaction between two electron beams. The remote observations enable to follow the electron beamsin the interplanetary medium and show that the level of radiated radio waves is recovered after the beamcrossing. The in situ observations of beam-driven Langmuir waves give evidence for Langmuir decay. Thedensity fluctuations are extracted from in situ observations. The velocity of the beams is independentlyevaluated from in situ observations of decaying Langmuir waves and remote radio observations. The kineticsimulations show that the level of beam-driven Langmuir waves is reduced as the two beams cross. Weshow that the slow beam induced a strong reduction of the quasilinear relaxation of the fast beam, limitingthe amplitude of the generated Langmuir waves. Moreover, in the case of two electron beams, the lack ofLangmuir wave coherence reduces the efficiency of the Langmuir parametric decay. We thus conclude thatthe observed depletion of the type III radio emission is independent of the radio emission mechanism, aslong as it depends on the Langmuir amplitude and coherence

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Section: Discussionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

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Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations

2014

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“…The in situ wave measurements have shown some signatures of the ESD in type III bursts (Lin et al, 1986;Gurnett et al, 1993;Hospodarsky and Gurnett, 1995;Thejappa and MacDowall, 1998;Thejappa et al, 2003;Henri et al, 2009). The high time resolution observations from the Fast Envelope Sampler (FES) of the ULYSSES/URAP experiment have provided some evidence for the strong Langmuir turbulence processes in type III burst sources (Kellogg et al, 1992;Thejappa et al, 1993Thejappa et al, , 1996Thejappa et al, , 1999MacDowall, 1998, 2004).…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Evidence for four- and three-wave interactions in solar type III radio emissions

2013

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The high time resolution observations obtained by the STEREO/WAVES experiment show that in the source regions of solar type III radio bursts, Langmuir waves often occur as intense localized wave packets with short durations of only few ms. One of these wave packets shows that it is a three-dimensional field structure with W_Ln_eT_e ~ 10⁻³, where W_L is the peak energy density, and n_e and T_e are the electron density and temperature, respectively. For this wave packet, the conditions of the oscillating two-stream instability (OTSI) and supersonic collapse are satisfied within the error range of determination of main parameters. The density cavity, observed during this wave packet indicates that its depth, width and temporal coincidence are consistent with those of a caviton, generated by the ponderomotive force of the collapsing wave packet. The spectrum of each of the parallel and perpendicular components of the wave packet contains a primary peak at f_pe, two secondary peaks at f_pe ± f_S and a low-frequency enhancement below f_S, which, as indicated by the frequency and wave number resonance conditions, and the fast Fourier transform (FFT)-based tricoherence spectral peak at (f_pe, f_pe, f_pe + f_S, f_pe − f_S), are coupled to each other by the OTSI type of four-wave interaction (f_pe is the local electron plasma frequency and f_S is the frequency of ion sound waves). In addition to the primary peak at f_pe, each of these spectra also contains a peak at 2f_pe, which as indicated by the frequency and wave number resonance conditions, and the wavelet-based bicoherence spectral peak at (f_pe, f_pe), appears to correspond to the second harmonic electromagnetic waves generated as a result of coalescence of oppositely propagating sidebands excited by the OTSI. Thus, these observations for the first time provide combined evidence that (1) the OTSI and related strong turbulence processes play a significant role in the stabilization of the electron beam, (2) the coalescence of the oppositely propagating up- and down-shifted daughter Langmuir waves excited by the OTSI probably is the emission mechanism of the second harmonic radiation, and (3) the Langmuir collapse follows the route of OTSI in some of the type III radio bursts

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“…From the observational point of view, numerous works have been devoted to test the validity of this model (Lin et al, 1981(Lin et al, , 1986Gurnett et al, 1993;Thejappa et al, 1993;Cairns, 1995;Thejappa et al, 2003). New evidence of such wave coupling processes have been recently provided from the analysis of waveform data from the STEREO/WAVES experiment (Henri et al, 2009). Since the phase of the waves are available from such measurements, it is possible to test the energy and momentum conservation laws induced by such coupling.…”

Section: Langmuir Wavesmentioning

confidence: 99%

Plasma waves above the ion cyclotron frequency in the solar wind: a review on observations

Briand

2009

Nonlin. Processes Geophys.

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Evidence for wave coupling in type III emissions

Cited by 64 publications

References 48 publications

Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations

Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations

Evidence for four- and three-wave interactions in solar type III radio emissions

Plasma waves above the ion cyclotron frequency in the solar wind: a review on observations

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