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Kelvin-Helmholtz instability in partially ionized compressible plasmas View all abstracts by submitter

Roberto Soler   Submitted: 2012-02-21 04:58

The Kelvin-Helmholtz Instability (KHI) has been observed in the solaratmosphere. Ion-neutral collisionsmay play a relevant role for the growth rate and evolution of the KHIin solar partially ionized plasmas asin, e.g., solar prominences. Here, we investigate the linear phase ofthe KHI at an interface between twopartially ionized magnetized plasmas in the presence of a shear flow.The effects of ion-neutral collisions andcompressibility are included in the analysis. We obtain the dispersionrelation of the linear modes and performparametric studies of the unstable solutions. We find that in theincompressible case the KHI is present for anyvelocity shear regardless the value of the collision frequency. In thecompressible case, the domain of instabilitydepends strongly on the plasma parameters, specially the collisionfrequency and the density contrast. For highcollision frequencies and low density contrasts the KHI is present forsuper-Alfvénic velocity shear only. Forhigh density contrasts the threshold velocity shear can be reduced tosub-Alfvénic values. For the particularcase of turbulent plumes in prominences, we conclude thatsub-Alfvénic flow velocities can trigger the KHIthanks to the ion-neutral coupling.

Authors: R. Soler, A. J. Diaz, J. L. Ballester, M. Goossens
Projects: None

Publication Status: Accepted for publication in ApJ
Last Modified: 2012-02-21 10:24
Go to main E-Print page  Implications of Non-cylindrical Flux Ropes for Magnetic Cloud Reconstruction Techniques and the Interpretation of Double Flux Rope Events  Revision of Solar Spicule Classification  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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