Instabilities of drift magnetosonic waves due to the magnetic drift resonance

The drift magnetosonic waves in a finite-pressure plasma are considered. Instabilities arising from the magnetic drift resonance of particles with waves are investigated for two cases: quasi-perpendicular and oblique propagations. It is shown that, in a wide range of both the density and temperature gradients, these waves can be excited even in a high-β (β≥1) plasma.