Global mode ULF pulsations in a magnetosphere with a nonmonotonic Alfven velocity profile

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Journal of Geophysical Research; (USA)

OSTI ID:5916393

Zhu, Xiaoming; Kivelson, M G ^[1]

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1. Univ. of California, Los Angeles (USA)

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 nonmonotonicity. Because of the rapid decrease of density at the plasmapause, the variation of the Alven 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.

• OSTI ID: 5916393
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:A2; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALFVEN WAVES
AMPLITUDES
CAVITIES
COLD PLASMA
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
HYDROMAGNETIC WAVES
INHOMOGENEOUS PLASMA
PLASMA
PLASMA DENSITY
PLASMAPAUSE
VARIATIONS