Nonmigrating Diurnal Tides in the Thermosphere

Details Nonmigrating Diurnal Tides in the Thermosphere Nonmigrating Diurnal Tides in the Thermosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa51a1214r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA51A-1214

Physics

[3332] Atmospheric Processes / Mesospheric Dynamics, [3360] Atmospheric Processes / Remote Sensing, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

Many thermospheric and ionospheric parameters viewed from a satellite platform exhibit a 4-peaked structure in longitude. Nonmigrating tides are thought to play a key role in generating this phenomenon through modulation of electric fields. However, direct global measurements above 120 km of neutral atmospheric variables have not previously been analyzed for tides. We present direct observations of nonmigrating diurnal tides in the 60-270 km range inferred from the UARS High Resolution Doppler Imager (HRDI) and the Wind Imaging Interferometer (WINDII). The wavenumber 4 pattern in longitude is convincingly identified a an eastward propagating zonal wavenumber-3 diurnal tide. We also identify a zonally averaged diurnal tide in the winter hemisphere, that may arise from tide-planetary wave interactions.

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