Direct observations of nonmigrating diurnal winds in the thermosphere

Details Direct observations of nonmigrating diurnal winds in the thermosphere Direct observations of nonmigrating diurnal winds in the thermosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa21b..02l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA21B-02

Physics

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

Scientific paper

We present observations of nonmigrating diurnal tides between 90 and 250 km inferred from the UARS wind imaging interferometer (WINDII). The zonal wind associated with an eastward-propagating wavenumber 3 exhibits a broad structure in latitude that is symmetric about the equator. The zonal wind wave is strongest during the fall months, with amplitudes between 6--8 m/s above 200 km. We have also identified the zonally averaged diurnal tide. Meridional winds are generally symmetric about the equator. While their amplitudes usually maximize near 120 km, values between 5--10 m/s are sustained above 200 km. Zonal winds have a strong antisymmetric component about the equator, and maximize at higher altitudes.

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