@article{VandenBroeck:6963,
      author        = "Vanden Broeck, Grégory and Bechet, Sabrina and Rauw,
                       Gregor and Clette, Frédéric",
      title         = "{Comparison of the magnetic structures in full-disk solar
                       Ca II K images and Sun-as-a-star S-Index}",
      month         = "Jul",
      year          = "2023",
}