QPOs during magnetar flares are not driven by mechanical normal modes of the crust

@inproceedings{Levin2006QPOsDM,
  title={QPOs during magnetar flares are not driven by mechanical normal modes of the crust},
  author={Yuri Levin},
  year={2006}
}
QPOs have been observed during three powerful magnetar flares, from SGR 0526−66, SGR 1806−20 and SGR 1900+14. These QPOs have been commonly interpreted as being driven by the mechanical modes of the magnetar's solid crust which are excited during the flare. Here we show that this interpretation is in sharp contradiction with the conventional magnetar model. Firstly, we show that a magnetar crustal mode decays on the time-scale of at most 1 s due to the emission of Alfven waves into the neutron… CONTINUE READING