Excitation of dust kinetic Alfven waves by semi-relativistic ion beams
- Department of Space Science, Institute of Space Technology, Islamabad (Pakistan)
- Department of Space Science, University of the Punjab, Lahore (Pakistan)
The growth rates for dust kinetic Alfvén wave (DKAW) based on semi-relativistic Maxwellian distribution function are investigated in a hot and magnetized plasma. The dispersion relation of DKAW is obtained on a dust acoustic velocity branch, and the kinetic instability due to cross-field semi-relativistic ion flow is examined by the effect of dust parameters. Analytical expressions are derived for various modes as a natural consequence of the form of the solution, and is shown through graphical representation that the presence of dust particles and the cross-field semi-relativistic ions sensibly modify the dispersion characteristics of low-frequency DKAW. The results are valid for a frequency regime well below the dust cyclotron frequency. We suggest that semi-relativistic particles are an important factor in the growth/damping of DKAWs. It is also found that relativistic effects appear with the dust lower hybrid frequency are more effective for dust kinetic Alfvén waves in the perpendicular component as compared to the parallel one. In particular, the relativistic effects associated with electrons suppress the instability while ions enhance the growth rates. The growth rates are significantly modified with dust parameters and streaming velocity of cross-field ions.
- OSTI ID:
- 22600223
- Journal Information:
- Physics of Plasmas, Vol. 23, Issue 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALFVEN WAVES
COMPARATIVE EVALUATIONS
CYCLOTRON FREQUENCY
CYCLOTRONS
DAMPING
DISPERSION RELATIONS
DISTRIBUTION
DISTRIBUTION FUNCTIONS
DUSTS
ELECTRONS
EXCITATION
HOT PLASMA
INSTABILITY
ION BEAMS
IONS
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
RELATIVISTIC RANGE
SOLUTIONS