GLOBAL MODES & DAMPING MODELS

By analogy with the local analysis (eq.2), the global damping of AEs depends sensitively on the wavefield structure $\vert\gamma/\omega\vert \sim k_\perp^2(s,\theta)$ and in particular on the short scale lengths created by mode conversion where $k^2_{\perp,\mathrm{fast}}\approx k^2_{\perp,\mathrm{slow}}$. It is therefore not surprising that the large discrepancies between theoretical stability predictions result more from the modeling of the AE wavefield structure and the mode conversion layers rather than the actual evaluation of the drive or damping.