Abstract:
A theoretical model to study electromagnetic ion cyclotron (EMIC) waves in kappa-Maxwellian
plasma is developed. The plasma is assumed to have five components, i.e., electrons, cool and hot protons,
and singly charged helium and oxygen ions. The kappa-Maxwellian anisotropic particle distribution
function is assumed for the hot protons. We use the Kyoto University Plasma Dispersion Analysis Package,
a full dispersion solver developed at Kyoto University, to obtain the numerical results and delineate the
oxygen, helium, and proton bands. Higher harmonics of the EMIC waves are also studied, and the effects
of the kappa distribution on the growth of these waves are clearly demonstrated. Our results are applied to
Cluster spacecraft observations of EMIC waves in the inner magnetosphere.
