Abstract
Elongated plasma density irregularities in the magnetosphere could guide extraordinary mode waves from a satellite and produce detectable ducted echoes. The ducted waves are undamped and immune to spatial attenuation. For instance, a 10% depletion 100 km wide is sufficient for echoes 10–30 dB above nonthermal continuum, regardless of the distance. The remote measurement of plasma density and magnetic field structure in the magnetosphere would be practical using such echoes.
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