Thursday, October 7, 2010

Ambipolar diffusion

Ambipolar diffusion is often invoked in magnetars to account for the energy released by these objects.  Ambipolar diffusion abets the delay of the strong magnetic field within the star whose energy can then power the quiescent and burst emission.   The authors argue that ambipolar diffusion is strongly depressed by superfluidity.  The typical ambipolar diffusion is non-solenoidal.  This means that the density of the material changes as the field evolves; therefore, weak reactions occur to reestablish the equilibria.  These weak reactions are suppressed by superconductivity because pairs must be broken and reformed to convert protons to neutron and vice versa.

arXiv:1010.1153 [pdfpsother]
Title: Ambipolar diffusion in superfluid neutron stars

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