Lunar tidal winds in the upper atmosphere over Jakarta

Details Lunar tidal winds in the upper atmosphere over Jakarta Lunar tidal winds in the upper atmosphere over Jakarta

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1192s&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A5, pp. SIA 15-1, CiteID 1192, DOI 10.1029/2002JA009528

Physics

Space Physics

3

Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics (0358), Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

Winds have been measured at heights from 70 to 120 km by means of a Meteor Wind Radar near Jakarta (6.4S, 106.7E) from 1993 to 1997. These data have been analysed for the lunar semidiurnal tide using a least squares fitting method. Generally lunar tidal amplitudes in the winds are about 2 m s-1 though the northward wind amplitude reaches 6 m s-1 in southern summer. Variations with height and season are shown and compared with the Global Scale Wave Model (GSWM). Often the agreement with the model is good but there is a difference in phase of the eastward wind in southern winter. The GSWM predicts a more rapid increase in northward wind magnitude with height than is observed. Year-to-year changes are examined for different seasons and these reveal sometimes consistent results and sometimes a variation in phase from year to year. Often the phase relations between eastward and northward winds at Jakarta are more characteristic of a Northern Hemisphere tide, as predicted by classical tidal theory, particularly in southern spring and summer.

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