Surface wave excitation of local field line oscillations

Details Surface wave excitation of local field line oscillations Surface wave excitation of local field line oscillations

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10012127u&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A7, p. 12,127-12,131

Physics

Geophysics

Geomagnetism, Geophysics, Magnetohydrodynamic Waves, Magnetohydrodynamics, Oscillations, Surface Waves, Wave Excitation, Earth Magnetosphere, Plasma Resonance, Wave Amplification

Scientific paper

The well-behaved solution of the hydromagnetic wave equation for a general class of initial conditions is used to study the ringing, phase-mixing, transient amplification of field line resonances. An expression for the phase-mixing time in terms of the amplitude of initial impulse at the magnetopause and the gradient of Alfven speed in the magnetosphere is derived. The features of free oscillation of field lines studied here compare well with the previous numerical studies for particular types of impulse excitations of the magnetosphere.

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