@article{Ren2020a,
  author = "J. Ren and S. Zou and J. Lu and N. Giertych and Y. Chen and R. H. Varney and A. S. Reimer",
  title = "Statistical Study of Ion Upflow and Downflow Observed by PFISR",
  year =  2020 ,
  journal = "Journal of Geophysical Research: Space Physics",
  volume = 125,
  number = 10,
  keywords = "pfisr",
  doi = "https://doi.org/10.1029/2020JA028179",
  url = "https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA028179"
}