Magnetic braking of the Earth´s rotation

The Earth´s rotation is decelerating at a rate of 8.8*10 exp-20 rad/s. Thus, a leap second is added to the year every two to four years. This deceleration is small, but the Earth weighs 6*10 exp 24 kg. A prony brake that achieves this deceleration would release 5.14*10 exp 11 kW, the equivalent of 514,000 1-GW nuclear power plants. Tides, volcanos, Coriolis-generated ocean currents and winds cannot absorb this much power. This leaves the induction generation which produces the Earth´s magnetic field as the most likely absorber of the deceleration power. The efficiency of this inaccessible induction generator cannot be calculated. However, it is thought that correlation of the Earth´s deceleration with its 0.09% weakening magnetic field could provide insight into the power generation process.<>