Electromagnetic instabilities in high-β anti-loss-cone plasmas

The stability of electromagnetic drift waves in high-β anti-loss-cone plasmas is investigated. These waves with propagation transverse to the external magnetic field are found to be unstable provided ρ > ρ_c, where ρ is the parameter which characterizes the strength of the anti-loss-cone. The growth rates associated with this instability (which may be called the anti-loss-cone drift instability) are ∼ 0·1Ω_e and they increase with the strength of the anti-loss-cone.