**6.6 Electromagnetic resistive instability**

These instabilities have been investigated in various positions of the acceleration channel of the thruster. The effect of radial magnetic field, thermal motions of plasma particles and electron collisions can induce time varying fields in the discharge oscillations. This can prompt an electromagnetic resistive instability in the Hall thruster. In this chapter, we derive the dispersion relation for the electromagnetic instabilities in a Hall thruster and conditions for the instability.
