THEMIS observation

Ma, Q., Li, W., Chen, L., Thorne, R., & Angelopoulos, V. (2014). Magnetosonic wave excitation by ion ring distributions in the Earth\textquoterights inner magnetosphere. Journal Of Geophysical Research: Space Physics, 119, 844-852. http://doi.org/10.1002/2013JA019591 (Original work published February 2014)