Observation of kinetic Alfven waves excited at substorm onset

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N. Klocker
R. Luhr
A. Korth
P. Robert


Ground-based observations of locally confined, very intense, drifting current systems by the EISCAT magnetometer cross in correlation with GEOS-2 measurements will be explained in terms of kinetic Alfven waves. Particle and magnetic flux measurements on GEOS-2 indicate an excitation of the waves at the inner edge of the Earthward-drifting plasma sheet by resonance mode conversion from hydromagnetic surface waves. The collapsing tail-like field configuration itself is identified as the surface wave. The comparison of theoretically deduced quantities with observational results reveals a satisfactory agreement between observations and theory.

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Klocker, N., Luhr, R., Korth, A., & Robert, P. (1985). Observation of kinetic Alfven waves excited at substorm onset. Journal of Geophysics, 57(1), 65-71. Retrieved from https://journal.geophysicsjournal.com/JofG/article/view/293


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