quasi-electrostatic

Li, W., Santolik, O., Bortnik, J., Thorne, R., Kletzing, C., Kurth, W., & Hospodarsky, G. (2016). New Chorus Wave Properties Near the Equator from Van Allen Probes Wave Observations. Geophysical Research Letters. http://doi.org/10.1002/2016GL068780 (Original work published May 2016)