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Your search keyword '"Wong AY"' showing total 14 results
Start Over Author "Wong AY" Journal physical review letters
14 results on '"Wong AY"'

1. Observation of Large-Scale Density Cavities and Parametric-Decay Instabilities in the High-Altitude Discrete Auroral Ionosphere under Pulsed Electromagnetic Radiation

Author

Liu Ly, Wong Ay, Lou-Chuang Lee, and Jun Chen

Subjects
Physics, COSMIC cancer database, Physics::Plasma Physics, Physics::Space Physics, General Physics and Astronomy, Satellite, Plasma, Electron, Atomic physics, Ionosphere, Energy source, Electromagnetic radiation, Magnetic field
Abstract

A large density cavity that measured 2000 km across and 500 km in height was observed by DEMETER and Formosat/COSMIC satellites in temporal and spatial relation to a new mode of propagation of electromagnetic (em) pulses between discrete magnetic field-aligned auroral plasmas to high altitudes. Recorded positive plasma potential from satellite probes is consistent with the expulsion of electrons in the creation of density cavities. High-frequency decay spectra support the concept of parametric instabilities fed by free energy sources.

Published
2009

3. Observations of intermittent chaos in plasmas

Author

Wong Ay, Cheung Py, and Donovan S

Subjects
Physics, business.industry, Fast Fourier transform, Plasma turbulence, General Physics and Astronomy, Plasma, Computational physics, law.invention, Physics::Fluid Dynamics, Nonlinear Sciences::Chaotic Dynamics, CHAOS (operating system), Optics, law, Intermittency, business
Abstract

L'existence de l'intermittence est confirmee par les signaux en temps reel, l'analyse spectrale et les sections de Poincare

Published
1988

4. Observation of large-scale density cavities and parametric-decay instabilities in the high-altitude discrete auroral ionosphere under pulsed electromagnetic radiation.

Author

Wong AY, Chen J, Lee LC, and Liu LY

Abstract

A large density cavity that measured 2000 km across and 500 km in height was observed by DEMETER and Formosat/COSMIC satellites in temporal and spatial relation to a new mode of propagation of electromagnetic (em) pulses between discrete magnetic field-aligned auroral plasmas to high altitudes. Recorded positive plasma potential from satellite probes is consistent with the expulsion of electrons in the creation of density cavities. High-frequency decay spectra support the concept of parametric instabilities fed by free energy sources.

Published
2009
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5. First laboratory observation of freely propagating electrostatic waves produced by intense, localized field structures

Author

McFarland MD and Wong AY

Abstract

Freely propagating electrostatic waves (free modes) are observed to be produced by intense, localized field structures in laboratory measurements performed in an unmagnetized plasma in a state of strong Langmuir turbulence. The freely traveling waves conform to the Langmuir dispersion relation and have an average frequency which is approximately 11% higher than the average frequency of the localized field structures. The observations are consistent with the predictions of strong Langmuir turbulence theory.

Published
2000
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