power law arises in the spectral tail which is in accord with
observed spectra. Previous: Numerical simulations Next: References Up: Ext. Abst.
Conclusions
In this work we have shown that there is interference effects
between the components of continuous wave spectra which change
the behavior of the profiles specially in the neighborhood of
the critical level. This fact produces profound differences with
the monochromatic case when the power spectrum is analyzed; a
power law arises in the spectral tail which is in accord with
observed spectra.
While for a single wave propagating towards the critical level the overturning condition occurs always before the critical level for a broad spectrum this condition does not seem to be necessarily satisfied. So this work ignores the dissipative effects because taking into account the preliminary results shown here they do not appear to be essential in the determination of the wave termination.
The wind irregularites simulations reproduce the observed perturbations and the main aspects of the observed spectra. The observed spectral slope has been obtained through mean wind - gravity wave interacctions.
In a near future we will address a generalization of the results
for any background wind abiding WKB theory. In this way the effects
of the advective interaction between the components of a broad
spectrum can be also analyzed. Note that the interactions of the
wave field play a double role in determining the power spectrum
from a Doppler shift point of view. As the background wind, a
component propagating in a wave field is Doppler shifted to the
spectral tail with a power law. Besides, these interactions also saturate the amplitudes.
The saturation originates in the correlation between energy content
of the wave field and the energy eliminated or deposited into
the critical layer. Clearly, the greater the wave field energy
the larger the energy deposited.
It is important to mention that the analysis we have done in this work is for a fixed time; the way in which the measurements are performed. Conclusions must not be extrapolated to a time dependent scenario.