Excitation of electron acoustic waves near the electron plasma frequency and at twice the plasma frequency

Schriver, D.; Ashour‐Abdalla, M.; Sotnikov, V. I.; Hellinger, Petr; Fiala, V.; Bingham, R.; Mangeney, A.

doi:10.1029/1999ja000301

Cited by 41 publications

(34 citation statements)

References 30 publications

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“…The hot population is distributed in the electrostatic potential and, taking into account that its density is small with respect to the density of cold component n h0 ( n c0 , we can keep only the terms linear in the perturbations: where L Dh and w pc are defined in section 3. Similar equation was obtained by Schriver et al [2000] using slightly different approximations. To describe the interaction of the primary Langmuir wave with the electron sound wave, one should replace in the nonlinear term on the righthand side of the equation the electrostatic potential of electron-sound wave f es by electrostatic potential of the Langmuir wave f L .…”

Section: Summary and Discussionsupporting

confidence: 55%

Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations

et al. 2005

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[1] The intense high-frequency electrostatic waves observed in the terrestrial foreshock often have a form of a superposition of two monochromatic waves close to the plasma frequency. We suggest an interpretation of these spectra as signatures of nonlinear decay of Langmuir waves to electron-sound and ion-sound secondary waves. This decay instability is known to have different properties in inhomogeneous plasma, namely the threshold amplitude of this instability is inversely proportional to the scale of the inhomogeneity. We show that the observed dependence of the wave amplitude on the modulation scale of the wave packets is consistent with this property and the theory of absolute decay instability in inhomogeneous plasma can be applied to explain the satellite observations. In this study we used electric field data from the Wide Band Data instrument on board Cluster satellites.

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Section: Summary and Discussionsupporting

confidence: 55%

Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations

et al. 2005

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“…The main effect of the nonlinearity is the appearance of Langmuir harmonics which are not obtained with the previous linear approaches (Apel, 1967;Manheimer, 1971;Joyce et al, 1971;O'Neil and Winfrey, 1972;Kellogg et al, 1986;Schriver et al, 2000). The electrostatic multiple Langmuir Harmonic (LH) waves in the electron beam instability is a known effect previously observed in laboratory (Apel, 1967), in spacecraft observation (Cairns, 1986), in spaceborne rockets (Kellogg et al, 1986), and in various numerical computer simulations (i.e., Joyce et al, 1971;Kasaba et al, 2001).…”

Section: Other Neial Signatures Related To Large-growth Nonlinear Beamentioning

confidence: 92%

Analysis of beam plasma instability effects on incoherent scatter spectra

et al. 2010

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Abstract. Naturally Enhanced Ion Acoustic Lines (NEIALs) detected with Incoherent Scatter Radars (ISRs) can be produced by a Langmuir decay mechanism, triggered by a bump on tail instability. A recent model of the beam-plasma instability suggests that weak-warm beams, such those associated with NEIAL events, might produce Langmuir harmonics which could be detected by a properly configured ISR. The analysis performed in this work shows that such a beamdriven wave may be simultaneously detected with NEIALs within the baseband signal of a single ISR. The analysis shows that simultaneous detection of NEIALs and the first Langmuir harmonic is more likely than simultaneous detection of NEIALs and enhanced plasma line. This detection not only would help to discriminate between current NEIAL models, but could also aid in the parameter estimation of soft precipitating electrons.

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“…The generation of these waves was studied by several authors (Dum, 1990;Cairns, 1989;Sotnikov et al, 1995). Recently, their generation and saturation have been studied via a computer simulation using Particle In Cell and Vlasov 1D codes (Schriver et al, 2000). A result of the simulation is shown in Fig.…”

Section: The Bow Shock and Foreshock Regionmentioning

confidence: 99%

Early results from the Whisper instrument on Cluster: an overview

Fergeau²,

et al. 2001

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Abstract. The Whisper instrument yields two data sets: (i) the electron density determined via the relaxation sounder, and (ii) the spectrum of natural plasma emissions in the frequency band 2-80 kHz. Both data sets allow for the threedimensional exploration of the magnetosphere by the Cluster mission. The total electron density can be derived unambiguously by the sounder in most magnetospheric regions, provided it is in the range of 0.25 to 80 cm −3 . The natural emissions already observed by earlier spacecraft are fairly well measured by the Whisper instrument, thanks to the digital technology which largely overcomes the limited telemetry allocation. The natural emissions are usually related to the plasma frequency, as identified by the sounder, and the combination of an active sounding operation and a passive survey operation provides a time resolution for the total density determination of 2.2 s in normal telemetry mode and 0.3 s in burst mode telemetry, respectively. Recorded on board the four spacecraft, the Whisper density data set forms a reference for other techniques measuring the electron population. We give examples of Whisper density data used to derive the vector gradient, and estimate the drift velocity of density structures. Wave observations are also of crucial interest for studying small-scale structures, as demonstrated in an example in the fore-shock region. Early results from the Whisper instrument are very encouraging, and demonstrate that the four-point Cluster measurements indeed bring a unique and completely novel view of the regions explored.Correspondence to: P. Décréau (pdecreau@cnrs-orleans.fr)

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Excitation of electron acoustic waves near the electron plasma frequency and at twice the plasma frequency

Cited by 41 publications

References 30 publications

Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations

Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations

Analysis of beam plasma instability effects on incoherent scatter spectra

Early results from the Whisper instrument on Cluster: an overview

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