spatial distribution

Saikin, A., Zhang, J. -C., Allen, R. C., Smith, C., Kistler, L., Spence, H., et al. (2015). The occurrence and wave properties of H + -, He + -, and O + -band EMIC waves observed by the Van Allen Probes. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1002/2015JA021358 (Original work published September 2015)
Zhang, X. -J., Thorne, R., Artemyev, A., Mourenas, D., Angelopoulos, V., Bortnik, J., et al. (2018). Properties of intense field-aligned lower-band chorus waves: Implications for nonlinear wave-particle interactions. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1029/2018JA025390 (Original work published June 2018)
Chen, H., Gao, X., Lu, Q., & Wang, S. (2019). Analyzing EMIC Waves in the Inner Magnetosphere Using Long-Term Van Allen Probes Observations. Journal Of Geophysical Research: Space Physics, 124, 7402-7412. http://doi.org/10.1029/2019JA026965 (Original work published August 2019)