Characteristics of the semidiurnal tide in the MLT over Maui (20.75°N, 156.43°W) with meteor radar observations

A. Guharay, S. J. Franke

Research output: Contribution to journalArticlepeer-review


Semidiurnal tidal features have been examined in the Mesosphere and Lower Thermosphere (MLT) from the long-term (2002-2007) meteor wind data over Maui (20.75°N, 156.43°W). Amplitude and phase obtained from the harmonic analysis exhibit large day to day variability. Mean amplitude obtained from the monthly mean data over the observation period is found to vary within ~8-28. m/s and 10-32. m/s for the zonal and meridional winds, respectively. The amplitude has revealed clear semiannual oscillation (SAO) pattern with maxima during solstices and altitudinal growth in both wind components. Significant resemblance in its variability with other observations carried out from the low latitude sites all over the globe is obtained. Vertical wavelength estimated from the phase gradients exposes large values (>90. km) in all seasons. Contribution of the semidiurnal tide to the total tidal variability in the MLT is found to vary over wide range throughout the year with generally higher influence during winter season over diurnal and terdiurnal components.

Original languageEnglish (US)
Pages (from-to)678-685
Number of pages8
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Issue number5-6
StatePublished - Apr 2011


  • Meteor radar observations
  • Middle atmosphere dynamics
  • Semidiurnal tide

ASJC Scopus subject areas

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science


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