There is a possibility of ships propelled by pulsing plasma jets in the air. This would use intense pulsed magnetic fields to push on air which the engine breaks up and heats into plasma.

A ship with pulsed plasma propulsion could be expected to produce bright flashs like the popping of flash bulbs, pulsed broad band radio noise, pulsed magnetic field and much noise.

I have been studying a form of this propulsion for a few years. Unfortunately I have not seen large pushes from it - especially in relation to the energy used.

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