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Il Nuovo Cimento C

, Volume 14, Issue 2, pp 203–206 | Cite as

Climatologies of tides at mid-latitudes in the lower thermosphere

  • G. Cevolani
Note Brevi

Summary

Time variations of the semi-diurnal and diurnal tides observed at Budrio (45°N, 12°E) in the wind structure of the lower thermosphere ((80÷110) km) throughout the period 1976–1990 are herewith represented as monthly contours of both amplitudes and phasesvs. height. The semi-diurnal tide has more marked seasonal variations, showing amplitudes generally larger than the diurnal ones ((10÷30) m/svs. (5÷15) m/s). The vertical wavelengths are longer in summer than in winter, at least below 100 km. Agreement with new numerical models for semi-diurnal tide at 50°N appears to be satisfactory.

PACS 92.60

Meteorology 

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Copyright information

© Società Italiana di Fisica 1991

Authors and Affiliations

  • G. Cevolani
    • 1
  1. 1.FISBAT/CNRBolognaItalia

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