Multiple Year Variations of the Mesosphere Lower Thermosphere Wind Field and Comparison with Empirical Models

Details Multiple Year Variations of the Mesosphere Lower Thermosphere Wind Field and Comparison with Empirical Models Multiple Year Variations of the Mesosphere Lower Thermosphere Wind Field and Comparison with Empirical Models

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa21b..02s&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA21B-02

Physics

0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition (3369), 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves, 3394 Instruments And Techniques

Scientific paper

A continuous record of mesosphere lower thermosphere winds collected by satellite instruments exist since late 1991. This data set comprises data from the WINDII and HRDI instruments on the UARS satellite and the TIDI instrument on TIMED. The HRDI and TIDI data overlap by more than two years, permitting the winds to be comprehensively inter-compared and validated and allowing a seamless transition between instruments. Examination of the data sets show many features which are common from year to year, such as an equinox maximum in the diurnal tide with the March equinox typically stronger than September. The data also show significant inter-annual variations, such as an approximately factor of 2 variation in the diurnal tide amplitude. Many of the variations are believed to be driven by the lower atmosphere and will not explicitly appear in an empirical model such as HWM07 which only includes solar drivers. This paper will study the variations in the wind field over time and examine the differences between the observed wind field and that predicted by models to provide an estimate of the systematic limitations of the models.

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