OH and OI airglow layer modulation by ducted short-period gravity waves

Effects of trapping altitude

Jonathan B. Snively, Victor P. Pasko, Michael J. Taylor

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    Perturbations to the OH and OI [O(1S) 557.7 nm] airglow layers by ducted gravity waves near the Brunt-Visl period are investigated using a 2-D numerical model. Airglow signatures of these waves are strongly determined by perturbations of O, O3, and H, which exhibit peak densities near and above mesopause. Strong periodic vertical wind components of short-period gravity waves induce opposite relative density perturbations above and below the layer density peaks. Airglow signatures for ducted waves depend on the specific vertical shapes and altitudes of the wave packets relative to ambient species density profiles; waves perturbing only the bottoms or tops of the layers produce signatures differing from those able to perturb the entire layer thickness. Line-of-sight cancellation occurs between opposite perturbations above and below airglow layer peaks, even for standing waves without vertical phase progression. Integrated brightness-weighted temperature and intensity can thus appear in-phase or antiphase for standing waves, depending on the wave-packet altitude relative to the density gradients. Comparisons of OH and OI layer intensities also reveal in-phase or antiphase relative intensity responses and do not directly indicate the phase of the wave perturbations at layer peak altitudes. Despite this ambiguity, simultaneous brightness-weighted temperature measurements may provide additional insight into wave structure, amplitude, and trapping altitude. For waves of sufficient amplitude that perturb steep density gradients, nonlinearity of the airglow response may be observable; this effect is most prominent when strong cancellation of the linear signature occurs.

    Original languageEnglish (US)
    Article numberA11311
    JournalJournal of Geophysical Research: Space Physics
    Volume115
    Issue number11
    DOIs
    StatePublished - Jan 1 2010

    Fingerprint

    Wave effects
    airglow
    Gravity waves
    gravity waves
    gravity
    gravity wave
    trapping
    Modulation
    modulation
    perturbation
    signatures
    Wave packets
    brightness temperature
    standing waves
    standing wave
    cancellation
    wave packets
    Luminance
    mesopause
    gradients

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Forestry
    • Oceanography
    • Aquatic Science
    • Ecology
    • Water Science and Technology
    • Soil Science
    • Geochemistry and Petrology
    • Earth-Surface Processes
    • Atmospheric Science
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science
    • Palaeontology

    Cite this

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    abstract = "Perturbations to the OH and OI [O(1S) 557.7 nm] airglow layers by ducted gravity waves near the Brunt-Visl period are investigated using a 2-D numerical model. Airglow signatures of these waves are strongly determined by perturbations of O, O3, and H, which exhibit peak densities near and above mesopause. Strong periodic vertical wind components of short-period gravity waves induce opposite relative density perturbations above and below the layer density peaks. Airglow signatures for ducted waves depend on the specific vertical shapes and altitudes of the wave packets relative to ambient species density profiles; waves perturbing only the bottoms or tops of the layers produce signatures differing from those able to perturb the entire layer thickness. Line-of-sight cancellation occurs between opposite perturbations above and below airglow layer peaks, even for standing waves without vertical phase progression. Integrated brightness-weighted temperature and intensity can thus appear in-phase or antiphase for standing waves, depending on the wave-packet altitude relative to the density gradients. Comparisons of OH and OI layer intensities also reveal in-phase or antiphase relative intensity responses and do not directly indicate the phase of the wave perturbations at layer peak altitudes. Despite this ambiguity, simultaneous brightness-weighted temperature measurements may provide additional insight into wave structure, amplitude, and trapping altitude. For waves of sufficient amplitude that perturb steep density gradients, nonlinearity of the airglow response may be observable; this effect is most prominent when strong cancellation of the linear signature occurs.",
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    OH and OI airglow layer modulation by ducted short-period gravity waves : Effects of trapping altitude. / Snively, Jonathan B.; Pasko, Victor P.; Taylor, Michael J.

    In: Journal of Geophysical Research: Space Physics, Vol. 115, No. 11, A11311, 01.01.2010.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - OH and OI airglow layer modulation by ducted short-period gravity waves

    T2 - Effects of trapping altitude

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    AU - Pasko, Victor P.

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