Abstract: The present invention is directed to mitigating orbital debris in outer space by concentrating the plasma existing in space. The debris mitigation method involves sending a satellite device 1 into space that can concentrate local plasma in a surrounding region to create a relatively high density plasma field 5. The satellite device 1 comprises a plasma concentrator. By sending such a satellite device 1 into a desired obit where debris are to be mitigated, the debris passing through the created high density plasma field 5 is caused to encounter a drag force, which results in a faster orbital decay for the debris. Multiple devices may work in cooperation to influence the same orbital debris or to mitigate debris over a larger area.