@misc{indiciaeade9e7b3ad09,
  title = {A time-dependent model of polar cap arcs},
  author = {Zhu, L. and Sojka, J. J. and Schunk, R. W. and Crain, D. J.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930049323},
  note = {Source identifier: 19930049323}
}