Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sct..conf..181b&link_type=abstract
Proceedings of the 6th Spacecraft Charging Conference. November 2-6, 1998. AFRL Science Center, Hanscom AFB, MA, USA., p.181-186
Physics
Scientific paper
Our research is aimed at understanding the propagation characteristics of electromagnetic pulses along electrodynamic tethers in the ionosphere. Such a pulse can occur as a tether-plasma system transitions between open-and closed-circuit states, i.e., no current to current-flowing states. This perturbation takes a finite amount of time to propagate along the tether and affects the surrounding ionospheric plasma as it does so. This interaction, in turn, affects the tether's transmission-line characteristics. Previous tether transmission-line models assume, as a first order approximation, that the plasma-sheathed tether can be modeled as a simple rigid coaxial transmission line. This has proven acceptable for tethers with low induced or driven voltages. An improved model is needed, however, when steady-state plasma-sheath dynamics cannot be assumed, such as for higher induced or driven voltages. A dynamic circuit model of the plasma-sheathed tether is developed with knowledge gained from theoretical analyses, particle-in-cell simulations, and experimental results. This model is implemented in SPICE, which allows the tether's transmission-line characteristics to be examined.
Bilen Sven G.
Gilchrist Brian E.
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