THE PLASMAPAUSE. “Changes in the large-scale convection electric field change the plasmaspheric configuration thus changing the locations where the plasmaspheric hiss (in the nightside, inside the plasmapause), EMIC waves (in the dusk sector, inside the plasmapause), and whistler mode chorus waves (in the morning sector, outside the plasmapause) occur.”
https://link.springer.com/article/10.12942/lrsp-2007-1