@misc{indiciae9797949e6519,
  title = {Range indices of geomagnetic activity},
  author = {W.F. Stuart and A.W. Green},
  year = {1988},
  doi = {10.1016/0021-9169(88)90107-9},
  url = {https://pubs.usgs.gov/publication/70013786},
  note = {Source identifier: 70013786}
}