| | |
| | |
Stat |
Members: 3658 Articles: 2'599'751 Articles rated: 2609
05 November 2024 |
|
| | | |
|
Article overview
| |
|
Magnetic Helicity and the Relaxation of Fossil Fields | Avery E. Broderick
; Ramesh Narayan
; | Date: |
5 Feb 2007 | Abstract: | In the absence of an active dynamo, purely poloidal magnetic field configurations are unstable to large-scale dynamical perturbations and ultimately reconnect away on Alfvenic timescales. Nevertheless, there are a number of classes of stars, including Ap stars, white dwarfs, and neutron stars which are thought to not contain active dynamos and yet do exhibit significant, large scale, surface magnetic fields. Braithwaite & Spruit (2004) have shown via simulations that the external poloidal magnetic field may be stabilized in such systems by a toroidal component in the stellar interior. We present a variational principle for computing the structure of a magnetic field within a conducting sphere surrounded by an insulating vacuum. We find a simple class of axisymmetric solutions parametrized by angular and radial quantum numbers. We discuss the implications that these may have for soft-gamma repeaters and pulsar magnetic field decay. | Source: | arXiv, astro-ph/0702128 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
|
| |
|
|
|