2005/06/04 by Vahid Rezania, Rezania, Vahid, J. C. Samson +2
Physics and Astronomy · #Astrophysics and Star Formation Studies #Dust and Plasma Wave Phenomena #Ionosphere and magnetosphere dynamics #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0506092
Revtex, 4 pages
arxiv created 2005/06/04 · arxiv updated 2009/12/01
We show that the interaction of an accretion disk with the magnetosphere of a neutron star can excite resonant shear Alfven waves with Hz-kHz frequencies in a region of enhanced density gradients. This is the the region where accretion material flows along the magnetic field lines in the magnetosphere. We argue that due to the pressure anisotropy produced by the plasma flow, firehose instabilities are likely to occur. Furthermore, for a dipolar field topology, we show that a new instability develops due to both magnetic field curvature and the plasma flow.