oxygen torus

e, N. \, Oimatsu, S., Keika, K., Kletzing, C., Kurth, W., De Pascuale, S., et al. (2015). Formation of the oxygen torus in the inner magnetosphere: Van Allen Probes observations. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1002/2014JA020593 (Original work published February 2015)
e, M., Matsuoka, A., Kumamoto, A., Kasahara, Y., Goldstein, J., Teramoto, M., et al. (2018). Longitudinal Structure of Oxygen Torus in the Inner Magnetosphere: Simultaneous Observations by Arase and Van Allen Probe A. Geophysical Research Letters, 177-10. http://doi.org/10.1029/2018GL080122 (Original work published October 2018)