  The observation of global acoustic waves (p modes) in the Sun has been key to
unveiling its internal structure and dynamics. A different kind of wave, known
as sectoral Rossby modes, have been observed and identified, which potentially
opens the door to probing internal processes that are inaccessible through p
mode helioseismology. Yet another set of waves, appearing as
retrograde-propagating, equatorially antisymmetric vorticity waves, have also
been observed but their identification remained elusive. Here, through a
numerical model implemented as an eigenvalue problem, we provide evidence
supporting the identification of those waves as a class of inertial eigenmodes,
distinct from the Rossby mode class, with radial velocities comparable to the
horizontal ones deep in the convective zone, but still small compared to the
horizontal velocities towards the surface. We also suggest that the signature
of tesseral-like Rossby modes might be present in the recent observational
data.
