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Electromagnetic ion cyclotron waves in the Earth's magnetosphere with a kappa‐Maxwellian particle distribution
Author(s) -
Sugiyama Hajime,
Singh Satyavir,
Omura Yoshiharu,
Shoji Masafumi,
Nunn David,
Summers Danny
Publication year - 2015
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2015ja021346
Subject(s) - magnetosphere , physics , atomic physics , whistler , proton , cyclotron , dispersion relation , electron , astrophysical plasma , charged particle , ion , computational physics , plasma , nuclear physics , condensed matter physics , quantum mechanics
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.