The magnetic fluid to remove the isothermal magnetization and magnetic field, thereby to produce a temperature drop in the fluid by the magnetocaloric effect, provides a method and apparatus for generating an outside air temperature of less than artificial heat absorbing body of the ultra-low temperature condenser. Magnetization heat is converted into mechanical work load by placing a first superconducting solenoid (72) the sealed chamber (80) having a door (76) opening the conduit (70) leading to the hole of the fluid therein. When energizing the solenoid (72), which generates a strong axial magnetic field exerts a magnetic attractive force to the fluid. When releasing the fluid by opening the door (76), which are accelerated toward and through a conduit (70) to a superconducting solenoid, where it is magnetized by a magnetic field having increased strength. The non-magnetic turbine (120) by attaching the conduit interior between the solenoid and the chamber, the kinetic energy equal to the magnetization heat acceleration flow stream is converted into mechanical work load, thereby isothermal magnetization is achieved. Fluid by removing the magnetic field after flowing into the bore of the solenoid, the temperature drop is achieved, thereby the fluid to be able to absorb the heat in the cryogenic condenser.