Impulse-excited hydromagnetic cavity and field-line resonances in the magnetosphere

Details Impulse-excited hydromagnetic cavity and field-line resonances in the magnetosphere Impulse-excited hydromagnetic cavity and field-line resonances in the magnetosphere

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..371a&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, April 1986, p. 371-385.

Computer Science

161

Atmospheric Models, Cavity Resonators, Compression Waves, Earth Magnetosphere, Magnetohydrodynamic Waves, Magnetopause, Ohmic Dissipation, Radial Velocity, Temporal Distribution, Velocity Distribution

Scientific paper

Detailed numerical results are presented from a model which determines the time development of hydromagnetic waves within a hemicylindrical magnetospheric cavity subject to a short-duration compressional stimulus at the magnetopause. The model allows a realistic radial variation of Alfven speed, arbitrary axial asymmetry, and the inclusion of ionospheric Joule dissipation. The results show the development of a set of compressional cavity resonances, and their coupling to a corresponding set of field-line resonances at positions where the cavity eigenperiods match the uncoupled field-line eigenperiods. Transient solutions having variable period with radial distance are important in establishing the field-line resonances, and can be locally dominant in certain regions of the outer magnetosphere. The variation with axial wavenumber m of the cavity eigenperiods is obtained, and it is shown that the magnetopause impulse drives the field-line resonances most efficiently for m of about 3. This suggests that small azimuthal wavenumbers are important in the terrestrial magnetosphere under analogous conditions. A variety of waveform and polarisation diagrams is given to aid in observational identification of such coupled resonances.

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