PURPOSE: To reduce disturbance to the attitude of a satellite by using a conductive refrigerant as a refrigerant and partially setting voltage and a magnetic field to the refrigerant so that the refrigerant is made to flow along a piping.

CONSTITUTION: The inside of a piping 1 is filled with a conductive refrigerant 2 such as an NaCl aqueous solution and mercury. An anode terminal 4 and a cathode terminal 5 for making currents 3 to flow in the rectangular direction to the direction of the flow of the refrigerant 2 to the refrigerant 2 are installed to one parts of the inside of the piping 1. Consequently, currents 3 are made to flow from the anode terminal 4 to the cathode terminal 5. Accordingly, there is no movable section including a rotary motion, thus reducing disturbance to the attitude of a satellite.