Observations of tidal temperature and wind perturbations in the mesopause region above Urbana. IL (40°N. 88°W)

Jirong Yu, Robert States, Steve J. Franke, Chester S. Gardner, Maura Hagan

Research output: Contribution to journalArticlepeer-review

Abstract

Na lidar and MF radar measurements of temperature and horizontal winds were conducted simultaneously during several continuous 24 h periods in March and April 1996 at the Urbana Atmospheric Observatory. The data are used to determine the amplitude and phase profiles of the 24 and 12 h tides in the mesopause region between about 82 and 100 km. The measured amplitudes and phases of the tidal components of the horizontal winds are generally consistent with the predictions of the global-scale wave model (GSWM). The measured 24 h temperature amplitude is comparable to the GSWM predictions between 85 and 96 km but is significantly larger than GSWM above 96 km. The measured phase progression is downward below 94 km with an inferred vertical wavelength of 14±1 km. Above 94 km the temperature phase progression is upward with a vertical wavelength of 12±1 km. The measurements suggest the presence of a diurnal heat source in the lower thermosphere which is generating a strong downwardly propagating 24 h wave.

Original languageEnglish (US)
Article number97GL01023
Pages (from-to)1207-1210
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number10
DOIs
StatePublished - 1997

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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