Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4345k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4345-4351.
Physics
249
Atmospheric Models, Earth Magnetosphere, Eigenvalues, Magnetohydrodynamic Waves, Plasma Resonance, Lines Of Force, Magnetic Flux, Spectrum Analysis
Scientific paper
In order to explain the excitation of selected field line resonances by a broadband source of the magnetospheric hydromagnetic wave spectrum, it is proposed that the preferential resonances correspond to global eigenmodes of the magnetospheric cavity. The behavior of ultralow frequency waves in the terrestrial magnetosphere is explained by the structure of global eigenmodes in the hydromagnetic box model of an inhomogeneous plasma. The coupling between localized field line resonance effects and global large-scale modes leads to damping of the latter. In the box model, the eigenmode equation yields a spectrum of discrete eigenfrequencies, for each of which the equation contains singular points where the field line resonance occurs. Solutions of the equation are described, and results are used to outline features of potentially observable modes.
Galland Kivelson Margaret
Southwood David J.
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