@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" }