Abstract:
The equations governing the neutral wind velocities and temperature, which depict
the oscillations of atmospheric tides, incorporate various elements of the atmosphere. These
factors comprise background wind, temperature profiles, and the atmosphere's composition,
including ozone, oxygen, carbon dioxide, water, etc. The current work describes the method of
solution of the atmospheric tidal model and investigates the effects of background wind and
dissipation processes on the migrating semidiurnal tides during the March equinox. Thermal
heating due to water vapour absorption in the troposphere, ozone in the stratosphere and oxygen
absorption in the thermosphere is considered in this model. Furthermore, the model takes into
account the various dissipation processes (i.e. ion drag and Hall coefficients, Newtonian
cooling, divergence of momentum and heat fluxes due to molecular and eddy diffusion) and
background wind. The semidiurnal tidal features obtained from the present model match well
with the Global Scale Wave Model (GSWM-98). The bar charts are presented to quantify the
effects of different parameters on horizontal winds for altitudes below 100 km and above 100
km, separately. It reveals that the background wind plays a vital role in deciding the semidiurnal
tidal amplitudes of zonal and meridional winds. Momentum and heat flux coefficients also
have a significant influence on semidiurnal tides. At higher altitudes (> 100 km), the ion drag
reduces the amplitude of semidiurnal tides considerably.
