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Article overview
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The Magnetohydrodynamics of Shock-Cloud Interaction in Three Dimensions | | Min-Su Shin
; James M. Stone
; Gregory F. Snyder
; | | Date: |
19 Feb 2008 | | Abstract: | The magnetohydrodynamic evolution of a dense spherical cloud as it interacts
with a strong planar shock is studied, as a model for shock interactions with
density inhomogeneities in the interstellar medium. The cloud is assumed to be
small enough that radiative cooling, thermal conduction, and self-gravity can
be ignored. A variety of initial orientations (including parallel,
perpendicular, and oblique to the incident shock normal) and strengths for the
magnetic field are investigated. During the early stages of the interaction
(less than twice the time taken for the transmitted shock to cross the interior
of the cloud) the structure and dynamics of the shocked cloud is fairly
insensitive to the magnetic field strength and orientation. However, at late
times strong fields substantially alter the dynamics of the cloud, suppressing
fragmentation and mixing by stabilizing the interface at the cloud surface.
Even weak magnetic fields can drastically alter the evolution of the cloud
compared to the hydrodynamic case. Weak fields of different geometries result
in different distributions and amplifications of the magnetic energy density,
which may affect the thermal and non-thermal x-ray emission expected from
shocked clouds associated with, for example, supernovae remnants. | | Source: | arXiv, 0802.2708 | | Services: | Forum | Review | PDF | Favorites | |
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