Plasma turbulence disc circulating the equatorial region of the plasmasphere identified by the plasma wave detector (PWS) onboard the akebono (EXOS-D) satellite

For the observation data of the plasma wave turbulence detected by the PWS(Plasma Wave and Sounder Experiment) on board the EXOS-D (Akebono) satellite, the enhancements of the upper hybrid wave emission called equatorial enhancement of the plasma wave turbulence (EPWAT) that are characterized by the increasing level of the upper hybrid emissions are studied on their occurrence regions and occurrence conditions. The results show that EPWAT's encircle the magnetic equator forming a disc region that spreads from 1,000k to 10,000km altitude without dependence on the local time. The generation of plasma wave turbulences, EPWAT's are possibly controlled by the plasma drift as principal source in the region of the magnetic equator due to existing electric field