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Title: How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission

Authors:
ORCiD logo; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1341768
Grant/Contract Number:
FG02-04ER54738
Resource Type:
Journal Article: Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 7; Related Information: CHORUS Timestamp: 2017-06-25 05:22:53; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Che, Haihong, Goldstein, Melvyn L., Diamond, Patrick H., and Sagdeev, Roald Z. How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission. United States: N. p., 2017. Web. doi:10.1073/pnas.1614055114.
Che, Haihong, Goldstein, Melvyn L., Diamond, Patrick H., & Sagdeev, Roald Z. How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission. United States. doi:10.1073/pnas.1614055114.
Che, Haihong, Goldstein, Melvyn L., Diamond, Patrick H., and Sagdeev, Roald Z. Mon . "How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission". United States. doi:10.1073/pnas.1614055114.
@article{osti_1341768,
title = {How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission},
author = {Che, Haihong and Goldstein, Melvyn L. and Diamond, Patrick H. and Sagdeev, Roald Z.},
abstractNote = {},
doi = {10.1073/pnas.1614055114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 7,
volume = 114,
place = {United States},
year = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1073/pnas.1614055114

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • Recently Thejappa et al. studied a specific Langmuir wave packet observed by STEREO A and argued based on the electric field from one of the three antennas that this packet satisfied the conditions for the oscillating two-stream instability (OTSI) and was undergoing wave collapse. We analyze the same event using all three electric components and show that, while the wave packet has structure consistent with collapse simulations and theory, the field strength is well below that required for collapse to proceed. Analyzing the three electric field components shows that the power spectrum and dominance of wave power perpendicular to themore » local magnetic field are inconsistent with OTSI. We show that this packet and other more intense packets are inconsistent with collapse and show no evidence of OTSI, but are likely trapped eigenmodes in density wells. Therefore, OTSI and collapse are unlikely explanations for intense Langmuir events observed in the solar wind.« less
  • We present observational evidence for the oscillating two stream instability (OTSI) and spatial collapse of Langmuir waves in the source region of a solar type III radio burst. High time resolution observations from the STEREO A spacecraft show that Langmuir waves excited by the electron beam occur as isolated field structures with short durations {approx}3.2 ms and with high intensities exceeding the strong turbulence thresholds. These short duration events are identified as the envelope solitons which have collapsed to spatial scales of a few hundred Debye lengths. The spectra of these wave packets contain an intense peak and two sidebands,more » corresponding to beam-resonant Langmuir waves, and down-shifted and up-shifted daughter Langmuir waves, respectively, and low-frequency enhancements below a few hundred Hz. The frequencies and wave numbers of these spectral components satisfy the resonance conditions of the OTSI. The observed high intensities, short scale lengths, sideband spectral structures, and low-frequency enhancements strongly suggest that the OTSI and spatial collapse of Langmuir waves probably control the nonlinear beam-plasma interactions in type III radio bursts.« less
  • A numerical simulation of a two-dimensional Langmuir collapse is carried out, making use of the symmetry of the potential in the cavity with respect to the center of the cavity. Three characteristic regimes are found in the final stage of the evolution of a cavity: (1) a collapse; (2) a drawn-out collapse; and (3) a quasi-stationary caviton. It is noted that this result is determined by the features of the two-dimensional geometry of the problem, and that the saturation of the nonlinearity plays a more important role than in the real three-dimensional case. 6 references.
  • Theoretical works by Barnes and Nebel [D. C. Barnes and R. A. Nebel, Phys. Plasmas 5, 2498 (1998); R. A. Nebel and D. C. Barnes, Fusion Technol. 38, 28 (1998)] have suggested that a tiny oscillating ion cloud (referred to as the periodically oscillating plasma sphere or POPS) may undergo a self-similar collapse in a harmonic oscillator potential formed by a uniform electron background. A major uncertainty in this oscillating plasma scheme is the stability of the virtual cathode that forms the harmonic oscillator potential. The electron-electron two-stream stability of the virtual cathode has previously been studied with a fluidmore » model, a slab kinetic model, a spherically symmetric kinetic model, and experimentally [R. A. Nebel and J. M. Finn, Phys. Plasmas 8, 1505 (2001); R. A. Nebel et al., Phys. Plasmas 12, 040501 (2005)]. Here the mode is studied with a two-dimensional particle-in-cell code. Results indicate stability limits near those of the previously spherically symmetric case.« less
  • The electrostatic activity in the post-saturation regime of the velocity anisotropy driven Weibel instability is investigated by means of 1D 3V particle in cell simulations. Two different initial simulation configurations have been chosen to characterize the electrostatic activity in the post-saturation stage. A secondary two stream instability arises in both cases. However, significant differences occur in the thickness of the electron streams, in their initial locations, and in their effects on the bulk electron phase space distribution. An Hamiltonian description of particle motion in a 1D setting explains these differences in terms of the effective potential experienced by particles asmore » a function of their initial perpendicular velocity. The different roles of the longitudinal electric field and the Lorentz force in the formation of electron streams are discussed.« less