Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-18
Mon.Not.Roy.Astron.Soc.Lett. 371 (2006) L74-L77
Astronomy and Astrophysics
Astrophysics
5 pages, 2 eps figures, minor corrections to match published version
Scientific paper
10.1111/j.1745-3933.2006.00211.x
We use a simple toy-model to discuss global MHD modes of a neutron star, taking into account the magnetic coupling between the elastic crust and the fluid core. Our results suggest that the notion of pure torsional crust modes is not useful for the coupled system, all modes excite Alfven waves in the core. However, we also show that the modes that are most likely to be excited by a fractured crust, eg. during a magnetar flare, are such that the crust and the core oscillate in concert. For our simple model, the frequencies of these modes are similar to the ``pure crustal'' frequencies. In addition, our model provides a natural explanation for the presence of lower frequency ($< 30$~Hz) QPOs seen in the December 2004 giant flare of SGR 1806-20.
Andersson Nils.
Glampedakis Kostas
Samuelsson Lars
No associations
LandOfFree
Elastic or magnetic? A toy model for global magnetar oscillations with implications for QPOs during flares does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Elastic or magnetic? A toy model for global magnetar oscillations with implications for QPOs during flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic or magnetic? A toy model for global magnetar oscillations with implications for QPOs during flares will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-679203