Time-Distance Helioseismology of Deep Meridional Circulation
Abstract
A key component of solar interior dynamics is the meridional circulation (MC), whose poleward component in the surface layers has been well observed. Time-distance helioseismic studies of the deep structure of MC, however, have yielded conflicting inferences. Here, following a summary of existing results we show how a large center-to-limb systematics (CLS) in the measured travel times of acoustic waves affect the inferences through an analysis of frequency dependence of CLS, using data from the Helioseismic and Doppler Imager (HMI) onboard Solar Dynamics Observatory (SDO). Our results point to the residual systematics in travel times as a major cause of differing inferences on the deep structure of MC.
Keywords
Cite
@article{arxiv.2004.12708,
title = {Time-Distance Helioseismology of Deep Meridional Circulation},
author = {S. P. Rajaguru and H. M. Antia},
journal= {arXiv preprint arXiv:2004.12708},
year = {2021}
}
Comments
6 pages, 3 figures, to appear in the Springer series Astrophysics and Space Science Proceedings of "Dynamics of the Sun & Stars: Honoring the Life & Work of Michael Thompson" (2020)