Constraining global solar models through helioseismic analysis
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Global hydrodynamic simulations of internal solar dynamics have focused on replicating the conditions for solar-like (equator rotating faster than the poles) differential rotation and meridional circulation using the results of
helioseismic inversions as a constraint. Inferences of meridional circulation, however, have provided controversial
results showing the possibility of one, two, or multiple cells along the radius. To help address this controversy and
develop a more robust understanding of global flow regimes in the solar interior, we apply a “forward-modeling”
approach to the analysis of helioseismic signatures of meridional circulation profiles obtained from numerical
simulations. We employ the global acoustic modeling code GALE to simulate the propagation of acoustic waves
through regimes of mean mass-flows generated by global hydrodynamic and magnetohydrodynamic models:
EULAG, the Pencil code, and the Rayleigh code. These models are used to create synthetic Dopplergram data
products, used as inputs for local time–distance helioseismology techniques. Helioseismic travel-time signals from
solutions obtained through global numerical simulations are compared directly with inferences from solar
observations, in order to set additional constraints on global model parameters in a direct way. We show that even
though these models are able to replicate solar-like differential rotation, the resulting rotationally constrained
convection develops a multicell global meridional circulation profile that is measurably inconsistent with local
time–distance inferences of solar observations. However, we find that the development of rotationally
unconstrained convection close to the model surface is able to maintain solar-like differential rotation, while
having a significant impact on the helioseismic travel-time signal, replicating solar observations within one
standard deviation of the error due to noise.
Abstract
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Sol, Hidrodinâmica
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Helioseismology, Solar convective zone, Solar meridional circulation, Hydrodynamical simulations
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https://iopscience.iop.org/article/10.3847/1538-4357/ac7a44