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اخترفیزیک و علوم فضایی 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • rayleigh–taylor instability in an ionized medium

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 795
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we study the linear theory of the magnetized rayleigh–taylor instability in a system consisting of ions and neutrals. both components are affected by a uniform vertical gravitational field. we consider ions and neutrals as two separate fluid systems that can exchange momentum through collisions. however, ions have a direct interaction with the magnetic field lines but neutrals are not affected by the field directly. the equations of our two-fluid model are linearized and by applying a set of proper boundary conditions, a general dispersion relation is derived for our two superposed fluids separated by a horizontal boundary. we found two unstable modes for a range of wavenumbers. it seems that one of the unstable modes corresponds to the ions and the other one is for the neutrals. both modes are reduced with increasing particle collision rate and ionization fraction. we show that if the two-fluid nature is considered, the rt instability would not be suppressed and we also show that the growth time of the perturbations increases. as an example, we apply our analysis to the local clouds which seem to have arisen because of the rt instability. assuming that the clouds are partially ionized, we find that the growth rate of these clouds increases in comparison to the fully ionized case.

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