Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1479z&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1479-1485.
Physics
62
Earth Magnetosphere, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Space Plasmas, Cavity Resonators, Compression Waves, Dissipation, Extremely Low Radio Frequencies, Propagation Velocity
Scientific paper
For a nonmonotonic Alfven velocity profile, the global mode of the magnetosphere can be shown to couple to multiple resonant field lines. The mode structure itself is greatly altered by introduction of nonmonotonicity. Because of the rapid decrease of density at the plasmapause, the variation of the Alfven velocity naturally separates the magnetosphere into inner and outer parts. ULF wave perturbations are found to be trapped in the Alfven velocity valleys and, under certain circumstances, ULF wave amplitudes in the inner magnetosphere are greatly enhanced. THe results obtained may explain some ULF perturbations observed in the low-latitude regions of the magnetosphere.
Galland Kivelson Margaret
Zhu Xiao-ming
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