Ramjet air electric propulsion.
Technology is in the process of development!
Ramjet air electrojet engines have a similar working principle as in ion engines. They are designed for long-term maintenance of spacecraft in low orbits – 150-250 km.
Instead of conventional rocket fuel or inert gases air flow of electrojet engine uses gases from the tenuous atmospheresurrounding the spacecraft.
– does not depend on fuel
– cost-effectiveness. Flying at very low altitude orbits will significantly reduce the cost of initiating and maintaining the spacecraft to the desired orbit as well as power transmitters and receivers for satellite communications.