"Forward modeling Helioseismic signatures of one- And two-cell meridion" by Andrey M. Stejko, Alexander G. Kosovichev et al.
 

Forward modeling Helioseismic signatures of one- And two-cell meridional circulation

Document Type

Article

Publication Date

4-20-2021

Abstract

Using a 3D global solver of the linearized Euler equations, we model acoustic oscillations over background velocity flow fields of single-cell meridional circulation with deep and shallow return flows as well as double-cell meridional circulation with strong and weak reversals. The velocities are generated using a mean-field hydrodynamic and dynamo model—moving through the regimes with minimal parameter changes, counterrotation near the base of the tachocline is induced by sign inversion of the nondiffusive action of turbulent Reynolds stresses (Λ-effect) due to the radial inhomogeneity of the Coriolis number. By mimicking the stochastic excitation of resonant modes in the convective interior, we simulate realization noise present in solar observations. Using deep-focusing to analyze differences in travel-time signatures between the four regimes, as well as comparing to solar observations, we show that current helioseismology techniques may offer important insights about the location and strength of the return flow; however, it may not currently be possible to definitively distinguish between profiles of single-cell or double-cell meridional circulation.

Identifier

85105570182 (Scopus)

Publication Title

Astrophysical Journal

External Full Text Location

https://doi.org/10.3847/1538-4357/abec70

e-ISSN

15384357

ISSN

0004637X

Issue

2

Volume

911

Grant

80NSSC19K0630

Fund Ref

National Aeronautics and Space Administration

This document is currently not available here.

Share

COinS