@misc{indiciae5e4ac3d2942b,
  title = {Model study of multiple polar cap arcs: Occurrence and spacing},
  author = {Zhu, L. and Sojka, J. J. and Schunk, R. W. and Crain, D. J.},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19950034070},
  note = {Source identifier: 19950034070}
}