PLASMA-WAVE TURBULENCE AT THE MAGNETOPAUSE - OBSERVATIONS FROM ISEE 1 AND 2

Plasma wave electric and magnetic fields in the vicinity of the magnetopause are investigated using recent measurements from the ISEE 1 and 2 spacecraft. Strong electric and magnetic field turbulence is often observed at the magnetopause. Two possible plasma instabilities, the electrostatic ion-cyclotron instability and the lower-hybrid-drift instability, are considered the primary candidates for explaining the broad-band electric field turbulence. The narrow-band electrostatic emissions near the local electron plasma frequency are believed to be either plasma oscillations or electrostatic waves near the upper-hybrid-resonance frequency.