adiation belt ultra-relativistic electrons

Ni, B., Zou, Z., Gu, X., Zhou, C., Thorne, R., Bortnik, J., et al. (2015). Variability of the pitch angle distribution of radiation belt ultra-relativistic electrons during and following intense geomagnetic storms: Van Allen Probes observations. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1002/2015JA021065 (Original work published May 2015)