Echo 7 - An electron beam experiment in the magnetosphere

The Echo 7 experiment is discussed. Echo 7 studied the electric and magnetic field configurations and the diffusion and energization of electrons moving along field lines crossing the equatorial plane between 6 and 10 R(E), where the inner plasma sheet interacts with the dipole field. Echo 7 also studied the beam-system interaction with the local auroral zone ionosphere. The methods used in these studies and the results achieved are reviewed. 28 refs.