The turbulent plasmasphere boundary layer

We explore multisatellite observations of enhanced plasma turbulence in the plasmasphere boundary layer during penetration of substorm-injected plasma jets into the plasmasphere. injection events. A turbulent plasmaspheric boundary layer forms initially near the pre-substorm plasmapause due to interactions between the injected and plasmaspheric populations. A number of plasma instabilities develops during this highly dynamic process via interaction of the overlapping hot and cold plasma populations and excites lower hybrid/fast magnetosonic turbulence and broadband hiss-like VLF waves. The outcomes the excited turbulence for the subauroral geospace, such as collisionless heating and acceleration of plasma particles to suprathermal energies, which enhances the downward heat flux and concomitant heating of the ionospheric electrons, are discussed.