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

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    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 languageEnglish (US)
    Article numberL06804
    JournalGeophysical Research Letters
    Volume37
    Issue number6
    DOIs
    StatePublished - Mar 1 2010

    Fingerprint

    auroras
    aurora
    electron
    electrojet
    energy flux
    erg
    modeling
    electrojets
    energy
    Joule heating
    perturbation
    heating
    finite difference time domain method
    elastic waves
    geometry
    atmosphere
    electrons
    signatures
    atmospheres
    propagation

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

    De Larquier, Sebastien ; Pasko, Victor P. ; Stenbaek-Nielsen, Hans C. ; Wilson, Charles R. ; Olson, John V. / Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations. In: Geophysical Research Letters. 2010 ; Vol. 37, No. 6.
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    Finite-difference time-domain modeling of infrasound from pulsating auroras and comparison with recent observations. / De Larquier, Sebastien; Pasko, Victor P.; Stenbaek-Nielsen, Hans C.; Wilson, Charles R.; Olson, John V.

    In: Geophysical Research Letters, Vol. 37, No. 6, L06804, 01.03.2010.

    Research output: Contribution to journalArticle

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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.

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    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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