Coupling modes of hydromagnetic oscillations in non-uniform, finite pressure plasmas - Two-fluids model

Details Coupling modes of hydromagnetic oscillations in non-uniform, finite pressure plasmas - Two-fluids model Coupling modes of hydromagnetic oscillations in non-uniform, finite pressure plasmas - Two-fluids model

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26.1141t&link_type=abstract

Planetary and Space Science, vol. 26, Dec. 1978, p. 1141-1148.

Other

3

Coupled Modes, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Nonuniform Plasmas, Plasma Oscillations, Two Fluid Models, Cold Plasmas, Magnetosonic Resonance, Plasmapause, Polarization Characteristics, Propagation Modes, Vibration Mode

Scientific paper

Within a framework of the two-fluids approximation, basic modes constituting hydromagnetic coupling oscillations in nonuniform finite-beta plasmas are examined. It is shown that the oscillations consist of a coupling between a localized mode and a propagating one, and a strong peak appears at a resonance point. In the case of isothermal plasma (electron temperature equals ion temperature), there are two localized modes, the Alfven (or drift Alfven) and the ion drift modes, and a propagating mode known as the fast magnetosonic wave. Coupling oscillations associated with the Alfven mode exhibit a nearly incompressible character, whereas those with the ion drift mode are compressional and diamagnetic. Furthermore, the slow magnetosonic wave also couples with the localized mode in the case when the electron temperature is much larger than ion temperature. Based on characteristics of these oscillations, the origin of geomagnetic pulsations is discussed in connection with the distribution of plasma parameters in the outer magnetosphere.

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