Electromagnetic Ion Cyclotron Waves in the Inner Magnetosphere with a Kappa-Maxwellian Proton Distribution

Thursday, 18 December 2014
Satyavir Singh1, Hajime Sugiyama2, Yoshiharu Omura2, Masafumi Shoji3, David Nunn4 and Danny Summers5, (1)Indian Institute of Geomagnetism, Upper Atmosphere, Navi Mumbai, India, (2)RISH Research Institute for Sustainable Humanosphere, Kyoto, Japan, (3)ISAS/JAXA, Sagamihara, Japan, (4)University of Southampton, School of Electronics and Computer Science, Southampton, United Kingdom, (5)Memorial University of Newfoundland, Dept of Math and Stats, St John's, Canada
Electromagnetic ion cyclotron (EMIC) waves are studied in kappa-Maxwellian plasma. The plasma is assumed to have five-components, i.e., electrons, cold and hot protons, singly charged helium and oxygen ions. The hot anisotropic protons are assumed to have kappa-Maxwellian anisotropic particle distribution function. The numerical results are obtained using KUPDAP (Kyoto University Plasma Dispersion Analysis Package), a full dispersion solver developed at Kyoto University. The growth/damping of oxygen, helium, and proton bands and higher harmonics of the EMIC waves are studied. The effects of the kappa distribution on the growth/damping of these waves are clearly demonstrated. The findings from our model are applied to EMIC wave observations in the inner magnetosphere by the Cluster spacecraft.