The Double Pulsar (J0737-3039) is an exceptional physical laboratory. It allows us to probe pulsar emission mechanisms, physical processes related to pulsars and General Relativity tests. In this poster we examine a mechanism where spin-down is caused by the field lines which are open with respect to the magnetosphere. The orbital variation of the magnetosphere adds a periodic imprint to the derivative of the spin frequency of pulsar B which will be observed as a higher order correction on the phase. This modulation can be used to provide information for clearing the signal received from Pulsar B from the noise which is essential for high precision General Relativity tests. We also evaluate the magnetic field of Pulsar B and the shape of the boundary.
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