Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations

Sebastien De Larquier; Victor P. Pasko; Hans C. Stenbaek-Nielsen; Charles R. Wilson; John V. Olson

doi:10.1029/2009GL042124

Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations

Sebastien De Larquier, Victor P. Pasko, Hans C. Stenbaek-Nielsen, Charles R. Wilson, John V. Olson

Electrical Engineering

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10 Scopus citations

Abstract

A FDTD model of infrasound propagation in a realistic atmosphere is used to provide quantitative interpretation of the recently reported infrasound signatures from pulsating aurora. The pressure perturbations observed on the ground are analyzed as a function of energy flux of precipitating auroral electrons and geometry and altitude localization of the source. The results indicate that fluxes on the order of 50 erg/cm²/s are needed to explain pressure waves magnitudes of 0.05 Pa observed on the ground. This energy is unlikely to be provided exclusively by precipitating electrons, and Joule heating associated with the electrojet modulated by the pulsating aurora may be responsible for part of the deposited energy.

Original language	English (US)
Article number	L06804
Journal	Geophysical Research Letters
Volume	37
Issue number	6
DOIs	https://doi.org/10.1029/2009GL042124
State	Published - Mar 2010

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2009GL042124

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title = "Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations",

abstract = "A FDTD model of infrasound propagation in a realistic atmosphere is used to provide quantitative interpretation of the recently reported infrasound signatures from pulsating aurora. The pressure perturbations observed on the ground are analyzed as a function of energy flux of precipitating auroral electrons and geometry and altitude localization of the source. The results indicate that fluxes on the order of 50 erg/cm2/s are needed to explain pressure waves magnitudes of 0.05 Pa observed on the ground. This energy is unlikely to be provided exclusively by precipitating electrons, and Joule heating associated with the electrojet modulated by the pulsating aurora may be responsible for part of the deposited energy.",

author = "{De Larquier}, Sebastien and Pasko, {Victor P.} and Stenbaek-Nielsen, {Hans C.} and Wilson, {Charles R.} and Olson, {John V.}",

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doi = "10.1029/2009GL042124",

language = "English (US)",

volume = "37",

journal = "Geophysical Research Letters",

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T1 - Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations

AU - De Larquier, Sebastien

AU - Pasko, Victor P.

AU - Stenbaek-Nielsen, Hans C.

AU - Wilson, Charles R.

AU - Olson, John V.

PY - 2010/3

Y1 - 2010/3

N2 - A FDTD model of infrasound propagation in a realistic atmosphere is used to provide quantitative interpretation of the recently reported infrasound signatures from pulsating aurora. The pressure perturbations observed on the ground are analyzed as a function of energy flux of precipitating auroral electrons and geometry and altitude localization of the source. The results indicate that fluxes on the order of 50 erg/cm2/s are needed to explain pressure waves magnitudes of 0.05 Pa observed on the ground. This energy is unlikely to be provided exclusively by precipitating electrons, and Joule heating associated with the electrojet modulated by the pulsating aurora may be responsible for part of the deposited energy.

AB - A FDTD model of infrasound propagation in a realistic atmosphere is used to provide quantitative interpretation of the recently reported infrasound signatures from pulsating aurora. The pressure perturbations observed on the ground are analyzed as a function of energy flux of precipitating auroral electrons and geometry and altitude localization of the source. The results indicate that fluxes on the order of 50 erg/cm2/s are needed to explain pressure waves magnitudes of 0.05 Pa observed on the ground. This energy is unlikely to be provided exclusively by precipitating electrons, and Joule heating associated with the electrojet modulated by the pulsating aurora may be responsible for part of the deposited energy.

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Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations

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