The Tropospheric Influence on the Upper Thermospheric Zonal Wind as Observed by CHAMP

Details The Tropospheric Influence on the Upper Thermospheric Zonal Wind as Observed by CHAMP The Tropospheric Influence on the Upper Thermospheric Zonal Wind as Observed by CHAMP

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1719h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1719

Physics

[3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

The German mini-satellite CHAMP has been in orbit now for more than 10 years providing continuous and globally distributed measurements of the upper atmosphere at about 400 km altitude. In the equatorial zonal wind a four-peaked longitudinal structure (wave-4) was identified exhibiting a distinct intra-annual variation with a major maximum from July through October and a secondary smaller maximum in March/April. It was demonstrated that the observed wave-4 pattern is caused predominately by the eastward propagating diurnal tide with zonal wavenumber 3 (DE3) that has its origin in the tropical troposphere. The eastward propagating diurnal tide with zonal wavenumber 2 (DE2), the westward propagating diurnal tide with zonal wavenumber 2 (DW2), and the standing diurnal tide (D0) are further strong nonmigrating tides present in the CHAMP zonal wind. While DE3 and DE2 amplitudes are increasing with decreasing solar flux, DW2 and D0 amplitudes are decreasing. For our analysis we make use of more than 6 years of measurements taken between June 2001 and December 2007. The calculated tidal spectra for this time period are compared to the results of a physics-based empirical model based on Hough Mode Extension fits to TIMED tides. Further we want to explore in more detail the observed stronger DE3 amplitudes along the magnetic equator compared to the geographic equator.

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