Active space debris removal doesn't have a single solution. However, it requires many solutions to be combined to have an affective result. My previous proposal of using solar sailed cleaners had one major flaw. Large solar sails generate drag when they are operated close to earth. Therefore, they are not an ideal solution for LEO debris cleaning. However, they can be utilized for higher altitude debris removal.
I thought about utilizing the earths magnetic field. Satellites at sun synchronous orbit almost follow the earths magnetic field. An O-Ring shaped satellite can adjust its velocity buy applying current around the O-ring to generate magnetic field. Depending on the direction of the magnetic field generated compared to earths magnetic field, the satellite can adjust its speed and position without needing propellants. The sun facing surface of the O-ring would be covered with solar panels to supply the necessary electricity.
If the O-Ring satellite can be made large enough (a folding design would help), the controlled generation of magnetic field can be used to slow down and deorbit small metallic space debris by generating eddy current on them. I was inspired by a magnet slowing down while falling down an aluminum tube.
Additionally, O-Ring satellite design can be used as an alternative to the more traditional sun synchronous orbiting communication satellites. Lower earth orbits allow earths magnetic field to be utilized for a propellent less navigation. An alternative to solar sails at lower altitudes. The O-Ring shape can also double as a large antenna.
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