Alfvén wave far field from steady-current tethers

Details Alfvén wave far field from steady-current tethers Alfvén wave far field from steady-current tethers

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10214625s&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A7, p. 14625-14630

Physics

Plasma Physics

10

Ionosphere: Active Experiments, Magnetospheric Physics: Electric Fields, Space Plasma Physics: Waves And Instabilities

Scientific paper

We analyze the Alfvén wave signature left behind in the ionosphere by orbiting insulated tethers operating as thrusters or generators with steady currents. Using a recent description of tether radiation to determine the far field, we show that, at their leading edges, the Alfvén wings have an Airy function crosswise structure. The field amplitude falls off weakly as the inverse cube root of the distance along the wave front. The front itself, which carries a negligible fraction of the power radiated as Alfvén waves, broadens proportionally to the cube root of that distance. We show that collisional decay becomes important at about 103km along the front. For tethers longer than about 2 km, the top and bottom structures (``wings'') are fully disjoint.

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