On the cascade spectrum of Langmuir waves observed in arecibo heating experiments

Research output: Contribution to journalArticle

Abstract

Two parametric instabilities cascading Langmuir waves, which are the sideband of the parametric decay instability (PDI) excited by an O-mode HF heating wave, are studied. The first one decays a Langmuir pump wave into a Langmuir sideband and an ion acoustic wave. Both resonant and nonresonant cascade processes are considered. A nonresonant cascade of Langmuir waves proceeds at the same location and is severely hampered by the frequency mismatch effect. Resonant cascade takes place in different resonant locations to minimize the frequency mismatch effect, but it has to overcome the propagation loss of the mother Langmuir wave in each cascade step. Depending on the propagation loss, the resonant cascade could have a lower threshold, but cascade lines spread over a height region. The second one is a three-dimensional coupling process that employs the lower hybrid wave as the decay mode. Through this process, the nonresonant cascade of Langmuir waves produces a broad spectrum of frequency-downshifted plasma waves, similar to that of experimentally observed HFPLs, in a narrow altitude range, which is preferentially located near the matching height of the PDI sideband.

Original languageEnglish (US)
Pages (from-to)115-119
Number of pages5
JournalPhysica Scripta
Volume69
Issue number2
DOIs
StatePublished - Feb 2004

Fingerprint

Cascade
Heating
cascades
heating
Experiment
sidebands
Decay
decay
Propagation
ion acoustic waves
propagation
plasma waves
Acoustic Waves
Pump
pumps
Plasma
thresholds
Minimise
Three-dimensional
Line

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

On the cascade spectrum of Langmuir waves observed in arecibo heating experiments. / Kuo, Spencer.

In: Physica Scripta, Vol. 69, No. 2, 02.2004, p. 115-119.

Research output: Contribution to journalArticle

@article{a7595f104911421d892d8effb6e5f400,
title = "On the cascade spectrum of Langmuir waves observed in arecibo heating experiments",
abstract = "Two parametric instabilities cascading Langmuir waves, which are the sideband of the parametric decay instability (PDI) excited by an O-mode HF heating wave, are studied. The first one decays a Langmuir pump wave into a Langmuir sideband and an ion acoustic wave. Both resonant and nonresonant cascade processes are considered. A nonresonant cascade of Langmuir waves proceeds at the same location and is severely hampered by the frequency mismatch effect. Resonant cascade takes place in different resonant locations to minimize the frequency mismatch effect, but it has to overcome the propagation loss of the mother Langmuir wave in each cascade step. Depending on the propagation loss, the resonant cascade could have a lower threshold, but cascade lines spread over a height region. The second one is a three-dimensional coupling process that employs the lower hybrid wave as the decay mode. Through this process, the nonresonant cascade of Langmuir waves produces a broad spectrum of frequency-downshifted plasma waves, similar to that of experimentally observed HFPLs, in a narrow altitude range, which is preferentially located near the matching height of the PDI sideband.",
author = "Spencer Kuo",
year = "2004",
month = "2",
doi = "10.1238/Physica.Regular.069a00115",
language = "English (US)",
volume = "69",
pages = "115--119",
journal = "Physica Scripta",
issn = "0031-8949",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - On the cascade spectrum of Langmuir waves observed in arecibo heating experiments

AU - Kuo, Spencer

PY - 2004/2

Y1 - 2004/2

N2 - Two parametric instabilities cascading Langmuir waves, which are the sideband of the parametric decay instability (PDI) excited by an O-mode HF heating wave, are studied. The first one decays a Langmuir pump wave into a Langmuir sideband and an ion acoustic wave. Both resonant and nonresonant cascade processes are considered. A nonresonant cascade of Langmuir waves proceeds at the same location and is severely hampered by the frequency mismatch effect. Resonant cascade takes place in different resonant locations to minimize the frequency mismatch effect, but it has to overcome the propagation loss of the mother Langmuir wave in each cascade step. Depending on the propagation loss, the resonant cascade could have a lower threshold, but cascade lines spread over a height region. The second one is a three-dimensional coupling process that employs the lower hybrid wave as the decay mode. Through this process, the nonresonant cascade of Langmuir waves produces a broad spectrum of frequency-downshifted plasma waves, similar to that of experimentally observed HFPLs, in a narrow altitude range, which is preferentially located near the matching height of the PDI sideband.

AB - Two parametric instabilities cascading Langmuir waves, which are the sideband of the parametric decay instability (PDI) excited by an O-mode HF heating wave, are studied. The first one decays a Langmuir pump wave into a Langmuir sideband and an ion acoustic wave. Both resonant and nonresonant cascade processes are considered. A nonresonant cascade of Langmuir waves proceeds at the same location and is severely hampered by the frequency mismatch effect. Resonant cascade takes place in different resonant locations to minimize the frequency mismatch effect, but it has to overcome the propagation loss of the mother Langmuir wave in each cascade step. Depending on the propagation loss, the resonant cascade could have a lower threshold, but cascade lines spread over a height region. The second one is a three-dimensional coupling process that employs the lower hybrid wave as the decay mode. Through this process, the nonresonant cascade of Langmuir waves produces a broad spectrum of frequency-downshifted plasma waves, similar to that of experimentally observed HFPLs, in a narrow altitude range, which is preferentially located near the matching height of the PDI sideband.

UR - http://www.scopus.com/inward/record.url?scp=0442311168&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0442311168&partnerID=8YFLogxK

U2 - 10.1238/Physica.Regular.069a00115

DO - 10.1238/Physica.Regular.069a00115

M3 - Article

VL - 69

SP - 115

EP - 119

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - 2

ER -