Non-linear dynamics of gravity wave driven flows in the solar radiative interior

We present results of non-linear numerical simulations of gravity wave driven shear flow oscillations in the equatorial plane of the solar radiative interior. These results show that many of the assumptions of quasi-linear theory are not valid. When only two waves are forced (prograde and retrograde...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2008-06, Vol.387 (2), p.616-630
Main Authors: Rogers, T. M., MacGregor, K. B., Glatzmaier, G. A.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Earth, ocean, space
Exact sciences and technology
Gravity
hydrodynamics
Nonlinear equations
Simulation
Sun: interior
waves
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Summary:We present results of non-linear numerical simulations of gravity wave driven shear flow oscillations in the equatorial plane of the solar radiative interior. These results show that many of the assumptions of quasi-linear theory are not valid. When only two waves are forced (prograde and retrograde), oscillatory mean flow is maintained; but critical layers often form and are dynamically important. When a spectrum of waves is forced, the non-linear wave–wave interactions are dynamically important, often acting to decrease the maintenance of a mean flow. The (in)coherence of such wave–wave interactions must be taken into account when describing wave-driven mean flows.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2008.13289.x