Long Term Observations of the low Latitude (1,1) Diurnal Migrating Tide From WINDII, HRDI and TIDI

Details Long Term Observations of the low Latitude (1,1) Diurnal Migrating Tide From WINDII, HRDI and TIDI Long Term Observations of the low Latitude (1,1) Diurnal Migrating Tide From WINDII, HRDI and TIDI

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa43a..07n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA43A-07

Physics

3369 Thermospheric Dynamics (0358), 3332 Mesospheric Dynamics

Scientific paper

The dominant feature in the global scale wind field in the low latitude mesosphere and lower thermosphere (MLT) region is the solar diurnal migrating tide, classically represented by the (1,1) Hough function. The meridional component of the horizontal neutral wind vector is relatively stable in this region making it possible to estimate the daily (1,1) amplitude and phase*. Observations of the MLT winds have been performed from satellite platforms by HRDI and WINDII (UARS) and by TIDI (TIMED) since September 1991 providing a unique and continuous global perspective of the classical (1,1) tide for nearly 15 years. This paper will describe new results from HRDI, WINDII, and TIDI of the daily and annual variation of the (1,1) tide. A long-term interannual variability is clear in the data sets with the amplitude of the (1,1) tide peaking near 100 m/s within a week of the March equinox in 1993, 1995, 1999, 2002, and 2004. Lesser peaks occur during intervening years as well as about two weeks following the September equinox. A secondary result that will be discussed is the correspondence between coincident (1,1) tide observations by different pairs of experiments (HRDI/WINDII) and (HRDI/TIDI). *Burrage, M. D., M. E. Hagan, W. R. Skinner, D. L. Wu, and P. B. Hays, Long-term variability in the solar diurnal tide observed by HRDI and simulated by the GSWM, Geophys. Res. Lett., 22, 2641, 1995.

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