Role of magnetic shear on the electrostatic current driven ion-cyclotron instability in the presence of parallel electric field |
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Authors: | Harsha Jalori AK Gwal |
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Institution: | (1) Space Science Laboratory, Institute of Physics and Electronics, Barkatullah University, 462 026 Bhopal, India |
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Abstract: | Recent observation and theoretical investigations have led to the significance of electrostatic ion cyclotron (EIC) waves
in the electrodynamics of acceleration process. The instability is one of the fundamental of a current carrying magnetized
plasma. The EIC instability has the lowest threshold current among the current driven instabilities. On the basis of local
analysis where inhomogeneities like the magnetic shear and the finite width current channel, have been ignored which is prevalent
in the magnetospheric environment. On the basis of non-local analysis interesting modification has been incorporated by the
inclusion of magnetic shear. In this paper we provide an analytical approach for the non-local treatment of current driven
electrostatic waves in presence of parallel electric field. The growth rate is significantly influenced by the field aligned
electron drift. The presence of electric field enhances the growth of EIC waves while magnetic shear stabilizes the system. |
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Keywords: | Magnetic shear electrostatic ion cyclotron waves magnetosphere |
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