On the Resistive Electromagnetic Ion Cyclotron Instability

An investigation is made on the conditions for validity of the analytical results for the resistive electromagnetic ion cyclotron instability discussed in a recent paper by Lee and Luhmann. The regions of validity in wavenumber space are determined numerically for various conbinations of plasma density, magnetic field, and electron drift velocity. It is concluded that the analytical results are good approximations over a large region of wavenumber space.