Resonant Alfven waves on auroral field lines

Details Resonant Alfven waves on auroral field lines Resonant Alfven waves on auroral field lines

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3402c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3402-3408. Research supported by the Lockheed Indep

Physics

14

Auroras, Geomagnetism, Lines Of Force, Magnetic Disturbances, Magnetic Field Configurations, Magnetohydrodynamic Waves, Magnetospheric Instability, Mathieu Function

Scientific paper

It is shown that resonant Alfven waves on dipole magnetic field geometry and plasma distributions suitable for auroral field lines can be conventiently treated in the theory of Mathieu functions. Resurgent interest in invoking large-scale Alfven waves to structure some elements of auroral electrodynamics calls for interpretation of measured perpendicular electric and magnetic disturbance fields in terms of Alfven waves. The ability to express the resonant eigenmodes in closed form in terms of Mathieu functions allows for convenient tests of the Alfven wave structuring hypothesis. Implications for current vector electric and magnetic disturbance measurements are discussed.

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