Cascade of the parametric decay instability in ionospheric heating experiments

Research output: Contribution to journalArticle

Abstract

A cascade of Langmuir waves excited by the O-mode radio waves in ionospheric heating experiments via tlie parametric decay instability (PDI) is studied. The threshold powers for each resonant and nonresonant cascade step are determined. The nonresonant cascade of mother Langmuir waves proceeds at tlie same location. However, each step of the resonant cascade occurs at a slightly different location so that the daughter wave can satisfy tlie local dispersion relation. In tlie resonance case the threshold power remains tlie same in each cascade. However, tlie mother Langmuir wave has to propagate downward to tlie resonant location of the daughter Langmuir wave for the next resonant cascade step. To compensate the propagation loss of tlie mother Langmuir wave, a large power ratio (̃10 dB) between two consecutive cascade lines in the observed HF wave enhanced plasma lines is required. The threshold powers for the nonresonant cascade steps are found to increase progressively as the cascade process proceeds. It is shown that tlie dependence of the threshold power on tlie step number N of tlie cascade for the nonresonant case is governed by ve/vi where ve and vi are the electron collision frequency and ion Landau damping rate, respectively. Tlie threshold power has a N2 dependence for ve« 2Nv i and a √N dependence for ve» 2JNv i. It explains why the second cascade line hardly generates a third in early Trornso heating experiments and why more cascade steps can occur in Arecibo's heating experiments.

Original languageEnglish (US)
Article number6
Pages (from-to)5593-5597
Number of pages5
JournalJournal of Geophysical Research: Space Physics
Volume106
Issue number4
StatePublished - 2001

Fingerprint

ionospheric heating
cascades
heating
decay
experiment
thresholds
radio wave
damping
collision
Landau damping
plasma
radio waves
electron
ion

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics

Cite this

Cascade of the parametric decay instability in ionospheric heating experiments. / Kuo, Spencer.

In: Journal of Geophysical Research: Space Physics, Vol. 106, No. 4, 6, 2001, p. 5593-5597.

Research output: Contribution to journalArticle

@article{655f615f22574eb19efdac1764c65ec8,
title = "Cascade of the parametric decay instability in ionospheric heating experiments",
abstract = "A cascade of Langmuir waves excited by the O-mode radio waves in ionospheric heating experiments via tlie parametric decay instability (PDI) is studied. The threshold powers for each resonant and nonresonant cascade step are determined. The nonresonant cascade of mother Langmuir waves proceeds at tlie same location. However, each step of the resonant cascade occurs at a slightly different location so that the daughter wave can satisfy tlie local dispersion relation. In tlie resonance case the threshold power remains tlie same in each cascade. However, tlie mother Langmuir wave has to propagate downward to tlie resonant location of the daughter Langmuir wave for the next resonant cascade step. To compensate the propagation loss of tlie mother Langmuir wave, a large power ratio (̃10 dB) between two consecutive cascade lines in the observed HF wave enhanced plasma lines is required. The threshold powers for the nonresonant cascade steps are found to increase progressively as the cascade process proceeds. It is shown that tlie dependence of the threshold power on tlie step number N of tlie cascade for the nonresonant case is governed by ve/vi where ve and vi are the electron collision frequency and ion Landau damping rate, respectively. Tlie threshold power has a N2 dependence for ve« 2Nv i and a √N dependence for ve» 2JNv i. It explains why the second cascade line hardly generates a third in early Trornso heating experiments and why more cascade steps can occur in Arecibo's heating experiments.",
author = "Spencer Kuo",
year = "2001",
language = "English (US)",
volume = "106",
pages = "5593--5597",
journal = "Journal of Geophysical Research: Space Physics",
issn = "0148-0227",
number = "4",

}

TY - JOUR

T1 - Cascade of the parametric decay instability in ionospheric heating experiments

AU - Kuo, Spencer

PY - 2001

Y1 - 2001

N2 - A cascade of Langmuir waves excited by the O-mode radio waves in ionospheric heating experiments via tlie parametric decay instability (PDI) is studied. The threshold powers for each resonant and nonresonant cascade step are determined. The nonresonant cascade of mother Langmuir waves proceeds at tlie same location. However, each step of the resonant cascade occurs at a slightly different location so that the daughter wave can satisfy tlie local dispersion relation. In tlie resonance case the threshold power remains tlie same in each cascade. However, tlie mother Langmuir wave has to propagate downward to tlie resonant location of the daughter Langmuir wave for the next resonant cascade step. To compensate the propagation loss of tlie mother Langmuir wave, a large power ratio (̃10 dB) between two consecutive cascade lines in the observed HF wave enhanced plasma lines is required. The threshold powers for the nonresonant cascade steps are found to increase progressively as the cascade process proceeds. It is shown that tlie dependence of the threshold power on tlie step number N of tlie cascade for the nonresonant case is governed by ve/vi where ve and vi are the electron collision frequency and ion Landau damping rate, respectively. Tlie threshold power has a N2 dependence for ve« 2Nv i and a √N dependence for ve» 2JNv i. It explains why the second cascade line hardly generates a third in early Trornso heating experiments and why more cascade steps can occur in Arecibo's heating experiments.

AB - A cascade of Langmuir waves excited by the O-mode radio waves in ionospheric heating experiments via tlie parametric decay instability (PDI) is studied. The threshold powers for each resonant and nonresonant cascade step are determined. The nonresonant cascade of mother Langmuir waves proceeds at tlie same location. However, each step of the resonant cascade occurs at a slightly different location so that the daughter wave can satisfy tlie local dispersion relation. In tlie resonance case the threshold power remains tlie same in each cascade. However, tlie mother Langmuir wave has to propagate downward to tlie resonant location of the daughter Langmuir wave for the next resonant cascade step. To compensate the propagation loss of tlie mother Langmuir wave, a large power ratio (̃10 dB) between two consecutive cascade lines in the observed HF wave enhanced plasma lines is required. The threshold powers for the nonresonant cascade steps are found to increase progressively as the cascade process proceeds. It is shown that tlie dependence of the threshold power on tlie step number N of tlie cascade for the nonresonant case is governed by ve/vi where ve and vi are the electron collision frequency and ion Landau damping rate, respectively. Tlie threshold power has a N2 dependence for ve« 2Nv i and a √N dependence for ve» 2JNv i. It explains why the second cascade line hardly generates a third in early Trornso heating experiments and why more cascade steps can occur in Arecibo's heating experiments.

UR - http://www.scopus.com/inward/record.url?scp=0442301979&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0442301979&partnerID=8YFLogxK

M3 - Article

VL - 106

SP - 5593

EP - 5597

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 0148-0227

IS - 4

M1 - 6

ER -