Analytic model of electromagnetic ion-cyclotron anisotropy instability
- IPST, University of Maryland, College Park, Maryland 20742-2431 (United States)
- School of Space Research, Kyung Hee University, 446-701 (Korea, Republic of)
In the present paper, the real frequency and growth rate associated with the electromagnetic ion cyclotron instability driven by temperature anisotropy are analytically modeled on the basis of conjecture and upon comparison with numerical roots of the dispersion relation. The ions are assumed to have an anisotropic distribution function with Maxwellian parallel distribution. Under such an assumption complex roots of the dispersion relation depend only on two dimensionless parameters, namely, the temperature anisotropy factor A=T{sub perpendiculari}/T{sub ||}i-1, where T{sub perpendiculari} and T{sub ||i} are the perpendicular and parallel ion temperatures, respectively, and the parallel ion beta, {beta}=(8{pi}nT{sub i}/B{sup 2}){sup 1/2}, where n and B are the plasma density and magnetic field intensity, respectively. The ion-cyclotron instability is thus heuristically modeled by complex frequency which is parametrically dependent on A and {beta}. The present result constitutes a useful shortcut research tool that may be employed in a wide variety of applications.
- OSTI ID:
- 21432205
- Journal Information:
- Physics of Plasmas, Vol. 17, Issue 8; Other Information: DOI: 10.1063/1.3480101; (c) 2010 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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