Nonmigrating Diurnal Tides in Mesospheric and Lower-Thermospheric Winds and Temperatures

Abstract

This paper presents analyses of nonmigrating diurnal tide signatures in High Resolution Doppler Imager mesospheric and lower-thermospheric winds and temperatures. A global comparison of both winds and temperature reveals equatorial features corresponding to nonmigrating tides. Structures interpreted as zonal mean and eastward nonmigrating diurnal tides display consistency between horizontal winds and temperatures. The second symmetric mode is prominent in the zonal mean and wavenumber 1. The gravest antisymmetric mode and the gravest symmetric or Kelvin mode are the main features in zonal wavenumbers 2 and 3. The amplitudes of the tides generally increase with altitude and maximize within 90?110 km.