Original scientific paper

Drift-wave instabilities in an anisotropic plasma

Bhimsen K. Shivamoggi ; Department of Theoretical, Physics, Research School of Physical Sciences, Australian National University, Canberra, Australia

Abstract

Electrostatic drift-wave instabilities in a nonuniform low-plasma wherein the ion¬-temperature parallel to the magnetic field is much smaller than that of the ion-temperature in the perpendicular direction are studied. Specifically, three problems are treated: (i) finite ion-Larmor-radius effects; (ii) effects of curvature in the magnetic field; (iii) drift-cyclotron instability. The results show that the forementioned anisotropy makes available more free-energy sources to aggravate the various instabilities. Finally, a study is made of electromagnetic drift waves in a nonuniform, anisotropic, finite-β plasma. The results show that: (1) the waves are unstable; (2) the ions out of resonance with the waves produce some damping. A purely oscillatory transverse wave exists that derives it energy source from the kinetic energy of the electron-thermal-motion parallel to the unperturbed magnetic field.

Keywords

Hrčak ID:

328268

URI

https://hrcak.srce.hr/328268

Publication date:

1.9.1982.

Article data in other languages: croatian

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