Ion foreshock

Takahashi, K., Vellante, M., Del Corpo, A., Claudepierre, S., Kletzing, C., Wygant, J., & Koga, K. (2019). Multiharmonic Toroidal Standing Alfv\ en Waves in the Midnight Sector Observed During a Geomagnetically Quiet Period. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1029/2019JA027370 (Original work published December 2019)