A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK

D. Pancheva, P. Mukhtarov, N. J. Mitchell, A. G. Beard, H. G. Muller

Research output: Contribution to journalReview article

18 Citations (Scopus)

Abstract

Meteor radars located in Bulgaria and the UK have been used to simultaneously measure winds in the mesosphere/lower-thermosphere region near 42.5°N, 26.6°E and 54.5°N, 3.9°W, respectively, over the period January 1991 to June 1992. The data have been used to investigate planetary waves and diurnal and semidiurnal tidal variability over the two sites. The tidal amplitudes at each site exhibit fluctuations as large as 300% on time scales from a few days to the intra-seasonal, with most of the variability being at intra-seasonal scales. Spectral and cross-wavelet analysis reveals closely related tidal variability over the two sites, indicating that the variability occurs on spatial scales large compared to the spacing between the two radars. In some, but not all, cases, periodic variability of tidal amplitudes is associated with simultaneously present planetary waves of similar period, suggesting the variability is a consequence of non-linear interaction. Calculation of the zonal wave number of a number of large amplitude planetary waves suggests that during summer 1991 the 2-day wave had a zonal wave number of 3, but that during January-February 1991 it had a zonal wave number of 4.

Original languageEnglish
Pages (from-to)1304-1315
Number of pages12
JournalAnnales Geophysicae
Volume18
Issue number10
DOIs
Publication statusPublished - 31 Oct 2000

Keywords

  • Meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geology
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK. / Pancheva, D.; Mukhtarov, P.; Mitchell, N. J.; Beard, A. G.; Muller, H. G.

In: Annales Geophysicae, Vol. 18, No. 10, 31.10.2000, p. 1304-1315.

Research output: Contribution to journalReview article

Pancheva, D. ; Mukhtarov, P. ; Mitchell, N. J. ; Beard, A. G. ; Muller, H. G. / A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK. In: Annales Geophysicae. 2000 ; Vol. 18, No. 10. pp. 1304-1315.
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