tokens: We acknowledge the financial support of the UnivEarthS Labex program at Sorbonne-Paris-Cité (ANR-10-LABX-0023 and ANR-11-IDEX-0005-02) through project SolarGeoMag. We also acknowledge the support from the ERC PoC SolarPredict project, CNES Solar Orbiter and INSU/PNST grants, and Idex SPC through the DAMSE project. We are grateful to Roger Ulrich for giving us digital access to his surface meridional circulation measurements. We also thank SIDC for access to their sunspot series observations. Wilcox Solar Observatory data used in this study were obtained via the Web site http://wso.stanford.edu on 2017 September 29 03:15:25 PDT, courtesy of J.T. Hoeksema. A.S.B. thanks M. DeRosa and A. Title for useful discussions. Numerical computations were performed on the S-CAPAD platform, IPGP, France and on the DIM-ACAV funded Anais server at CEA/IRFU. IPGP contribution 3889.
ner_tags: O O O O O O O B-Organization B-Grant I-Grant O B-Organization B-Grant O B-Grant O O B-Grant O O O O O O O B-Organization B-Grant I-Grant I-Grant B-Organization B-Telescope I-Telescope O B-Organization O O B-Grant I-Grant O O B-Grant I-Grant O O O O B-Person I-Person O O O O O O O O O O O O O O B-Organization O O O O O O O B-Observatory I-Observatory I-Observatory O O O O O O O O O O O B-URL O O O O O O O O B-Person I-Person B-Person O B-Person I-Person O B-Person I-Person O O O O O O O O O B-ComputingFacility I-ComputingFacility B-Organization B-Location O O O B-Organization O B-ComputingFacility I-ComputingFacility O B-Organization B-Organization B-Grant I-Grant