Abstract Details
| Name: SP Rajaguru Affiliation: IIA, Bengaluru Conference ID: ASI2019_442 Title : Meridional circulation in the solar convection zone: current consensus from helioseismology Authors and Co-Authors : S.P. Rajaguru (1), H.M. Antia (2), K. Mandal (2), S.M. Hanasoge (2) (1). Indian Institute of Astrophysics, Bangalore, India (2). Tata Institute of Fundamental Research, Mumbai, India Abstract Type : Invited Abstract Category : Sun and the Solar System Abstract : A key component of solar interior dynamics is the meridional circulation (MC), which has been well observed on the surface and near-surface layers. A modeled deep structure for MC also plays a central role in flux transport dynamo models -- the most successful ones to date in explaining the global solar magnetism and the solar cycle. Helioseismic observation of the deep structure of MC, however, has been prone to large uncertainties and conflicting inferences from different groups/researchers. Here, we present a survey of all the existing results, including the authors' latest ones, that favor a deep single-cell MC. We also present results on the temporal variations, which point to dependences on the surface magnetic activity (and hence the phase of the solar cycle). We discuss possible implications of our results for models that relate the differential rotation, MC and magnetic fields. We also provide a critical assessment of the different estimates, and discuss a plausible consensus that can be reached as of now given the systematics and noise involved. |