Identification of inertial modes in the solar convection zone
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Resumo
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, has 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, has 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 toward the surface. We also suggest that
the signature of tesseral-like Rossby modes might be present in recent observational data.
Abstract
Assunto
Astrofísica, Sol
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Astrophysical fluid dynamics, Solar oscillations, Solar rotation
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Endereço externo
https://iopscience.iop.org/article/10.3847/2041-8213/ac7dac