LINEARIZED OSCILLATIONS IN A PLASMA
Technical Report
·
OSTI ID:4837437
The possible modes of oscillation of a plasma are determined from the linearized equations of the two-fluid model. The linearization is carried out in the presence of a strong steady magnetic field, and only wave propagation normal to the magnetic field is considered. The equations determine the regimes of applicability for the single-fluid equations and the magneto-ionic theory; and both theories are found to be special cases of the general equations. The linearized equations of the single-fluid model are used to investigate the interaction of a low frequency electromagnetic wave with a semi-infinite plasma. Solutions are obtained for both normal incidence and parallel propagation of the electromagnetic wave. In both cases a strong steady magnetic field exists parallel to the interface. It is found that the ratio of the Alfven velocity to the speed of sound is the parameter that determines the character of the solution. The magneto-ionic theory is found to be a special case of the linearized two- fluid equations. If collisions of identical particles are neglected, the theory of radio wave propagation results. The results of the magneto-ionic theory are characterized by the applied frequency, the electron gyrofrequency, the plasma frequency, the collision frequency of electrons and ions, and the electron-to-ion mass ratio. The dispersion relation yields two types of polarizations for the waves; one of which is unaffected by the presence of the magnetic field. (auth)
- Research Organization:
- Cornell Univ., Ithaca, N.Y. Graduate School of Aeronautical Engineering
- NSA Number:
- NSA-15-032795
- OSTI ID:
- 4837437
- Report Number(s):
- AFOSR-1026
- Country of Publication:
- United States
- Language:
- English
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