Axisymmetric force-free magnetosphere in the exterior of a neutron star II: Maximum storage and open field energies
arXiv:1801.06292 · doi:10.1093/mnras/sty176
Abstract
A magnetar's magnetosphere gradually evolves by the injection of energy and helicity from the interior. Axisymmetric static solutions for a relativistic force-free magnetosphere with a power-law current model are numerically obtained. They provide information about the configurations in which the stored energy is large. The energy along a sequence of equilibria increases and becomes sufficient to open the magnetic field. A magnetic flux rope, in which a large amount of toroidal field is confined, is formed in the vicinity of the star, for states exceeding the open field energy. These states are energetically metastable, and the excess energy may be ejected as a magnetar outburst.
8 pages, 5 figures
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Cited by in corpus (4)
- Crust-magnetosphere coupling during magnetar evolution and implications for the surface temperature
- Instability of twisted magnetar magnetospheres
- Twisted magnetosphere with quadrupolar fields in the exterior of a neutron star
- General-relativistic magnetar magnetospheres in 3D with physics-informed neural networks