@misc{indiciaebcccb01fde7f,
  title = {A description of the external and internal quiet daily variation currents at North American locations for a quiet-Sun year.},
  author = {W.H. Campbell},
  year = {1983},
  doi = {10.1111/j.1365-246x.1983.tb03806.x},
  url = {https://pubs.usgs.gov/publication/70011302},
  note = {Source identifier: 70011302}
}