Physics – Geophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.5843e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 5843-5846
Physics
Geophysics
2
Auroral Zones, Field Aligned Currents, Geomagnetic Pulsations, Magnetic Fields, Magnetohydrodynamic Waves, Plasma Currents, Earth Magnetosphere, Geophysics, Mathematical Models, Wave Interaction, Wave Propagation
Scientific paper
We have modeled the auroral magnetized plasma as an inhomogeneous current-carrying plasma and have shown that some features of the magnetic pulsations in that region not yet explained might be clarified by the discrete Alfven eigenmode propagation in that plasma. This mode has the frequency outside of the shear Alfven continuum, and it is a global mode rather than a localized Alfven noneigenmode in inhomogeneous media. Discrete Alfven waves are also described by the two-fluid model finite omega/omega (sub ci), where omega (sub ci) is the ion cyclotron frequency. In this paper we show that the current-carrying magnetic field tube in magnetosphere can sustain discrete Alfven modes whose frequency is compatible with the ultralow-frequency pulsations observed.
de Assis Altair S.
de Azevedo Carlos A.
de Azevedo M. T.
Elías Carlos
Sakanaka Paulo Hiroshi
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