observation

Min, K., Liu, K., Bonnell, J., Breneman, A., Denton, R., Funsten, H., et al. (2015). Study of EMIC wave excitation using direct ion measurements. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1002/2014JA020717 (Original work published March 2015)
Kubota, Y., Omura, Y., Kletzing, C., & Reeves, G. (2018). Generation process of large-amplitude upper band chorus emissions observed by Van Allen Probes. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1029/2017JA024782 (Original work published April 2018)