inner belt and slot region

Zhao, H., Friedel, R., Chen, Y., Reeves, G., Baker, D., Li, X., et al. (2018). An empirical model of radiation belt electron pitch angle distributions based on Van Allen Probes measurements. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1029/2018JA025277 (Original work published April 2018)
Hua, M., Li, W., Ma, Q., Ni, B., Nishimura, Y., Shen, X. -C., & Li, H. (2019). Modeling the Electron Flux Enhancement and Butterfly Pitch Angle Distributions on L Shells <2.5. Geophysical Research Letters, 46, 10967-10976. http://doi.org/10.1029/2019GL084822 (Original work published September 2019)