English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Short-period gravity waves of especially-small horizontal scale have been\udobserved in the Maui, Hawaii airglow. Typical small-scale gravity wave events\udhave been investigated, and intrinsic wave propagation characteristics have\udbeen calculated from simultaneous meteor radar wind measurements. Here we\udreport specific cases where wave structure is significantly determined by the\udlocal wind structure, and where wave characteristics are consistent with\udducted or evanescent waves throughout the mesopause region. Two of the\uddocumented events, exhibiting similar airglow signatures but dramatically\uddifferent propagation conditions, are selected for simple numerical modeling\udcase studies. First, a Doppler-ducted wave trapped within relatively weak\udwind flow is examined. Model results confirm that the wave is propagating in\udthe 85–95 km region, trapped weakly by evanescence above and below. Second,\udan evanescent wave in strong wind flow is examined. Model results suggest an\udopposite case from the first case study, where the wave is instead trapped\udabove or below the mesopause region, with strong evanescence arising in the\ud85–95 km airglow region. Distinct differences between the characteristics of\udthese visibly-similar wave events demonstrate the need for simultaneous\udobservations of mesopause winds to properly assess local propagation\udconditions

Analysis and modeling of ducted and evanescent gravity waves observed in the Hawaiian airglow